A collection of math mnemonics for geometry - to help you to remember various math facts, formulas and figures pertaining to geometry.

### Geometry Terms

Geometry Vocabulary Song

On the _________ day of math class my teacher taught to me.....

(1) A line goes forever 2 ways

(2) A segment is a part

(3) A ray goes 1 way

(4) Point is a dot

(5) Supplement is the sum of 180

(6) Bisect cuts in half

(7) Comp adds to 90

(8) Collinear on a line

(9) Perpendicular make a 90

(10) Vertical needs an x

(11) Midpoint is the mean

(12) Equal is congruent### Value of Pi (π)

**Count the number of letters in each word:**

Near A Raven, an Edgar Allen Poe-esque poem which currently holds the record for longest pi mnemonic, at 740 digits.

Cadaeic Cadenza, a short story (!) which is longer still at 3835 decimal places, and has additional constraints.

A song to help you memorize pi up to about 300 digits

### Area and Circumference of Circle

Tweedle-dee-dum and Tweedle-dee-dee,

Around the circle is pi times d,

But if the area is declared,

Think of the formula π "r" squared.### Types of triangles

A song to help you remember the different types of triangles - equilateral, isosceles, scalene, right

### Angles

A song to help you remember the different types of angles - acute, right, straight, obtuse, reflex, full rotation

**C**omplementary angles form a **c**orner.

This video shows three methods to help you remember complementary and supplementary angles.

Method 1: In the alphabet, the letter "C" for complementary comes before the letter "S" for supplementary and in the number line 90 comes before 180.

Method 2: A corner is 90-degree angle and a**C**orner is **C**omplementary.
A straight angle is 180 degrees and **S**upplementary angles are **S**traight angles.

Method 3: The word complementary has one p, the word supplementary has two p's. We can take one p to represent 90 and two p's to represent 180. Angle Properties (Math Song)

In geometry if you want to fare well

You need to know that parallel lines

They never touch

They're always the same distance apart

It's as if they don't like each other much

And there's only one thing that comes between them

Yes a line that passes right through each of them

It's called the transversal

And it has several angle properties

Just like these

Vertically opposite angles are equal!

Corresponding angles are equal!

Alternate interior angles are equal!

Co-interior angles equal 180

Now before you try some geometry problems

You're gonna need some more knowledge to solve them

So listen closely up to these

Other helpful angle properties

See, angles in a triangle or on a line

Add up to 180 every time

Angles around a point or in a quadrilateral are easy

They always add up to 360

Vertically opposite angles are equal!

Corresponding angles are equal!

Alternate interior angles are equal!

Co-interior angles equal 180

-----

Song and video by Colin Dodds

### Perimeter and Area

This song helps you to remember the difference between perimeter and area.
### Area Formulas

Math Song (Area Formulae)

Learn the 6 major plane shape formulae musically: Square, Rectangle, Triangle, Parallelogram, Rhombus/Kite and Trapezium (Trapezoid).**3-D Shapes Song**

A song to help you learn the properties of 3-D shapes.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

In these lessons, we shall look at some useful mnemonics and songs to help you remember

- geometry terms
- the value of pi
**(π)** - the formulas for the area and circumference of a circle
- the types of triangles: equilateral, isosceles, scalene, right
- types of angles - acute, right, straight, obtuse, reflex, full rotation
- complementary and supplementary angles
- angle properties
- perimeter and area
- area formulas
- 3 D shapes

On the _________ day of math class my teacher taught to me.....

(1) A line goes forever 2 ways

(2) A segment is a part

(3) A ray goes 1 way

(4) Point is a dot

(5) Supplement is the sum of 180

(6) Bisect cuts in half

(7) Comp adds to 90

(8) Collinear on a line

(9) Perpendicular make a 90

(10) Vertical needs an x

(11) Midpoint is the mean

(12) Equal is congruent

**Pi (π) to 7 decimal places:** (Word lengths are digits)

May I have a large container of coffee?

3.1415926

**Pi (π) to 10 decimal places:** (Word lengths are digits)

May I have a large container of coffee ready for today?

3.1415926535

**Pi (π) to 12 decimal places: **(Word lengths are digits)

See, I have a rhyme assisting my feeble brain, its tasks oft-times resisting.

3.141592653589

**Pi (π) to 30 decimal places:** (Word lengths are digits)

Now I, even I, would celebrate

In rhymes unapt, the great

Immortal Syracusan, rivaled nevermore,

Who in his wondrous lore,

Passed on before,

Left men his guidance

How to circles mensurate.

**and another one also to 30 decimal places (written by Michael Shapiro)
**

Now I will a rhyme construct

By chosen words the young instruct.

Cunningly devised endeavour,

Con it and remember ever.

Widths of circle here you see.

Sketched out in strange obscurity.

3.1415926535897932384626433832795 (Should we stop here?)

Should you have a repressed desire to experience a brain implosion, try these:Near A Raven, an Edgar Allen Poe-esque poem which currently holds the record for longest pi mnemonic, at 740 digits.

Cadaeic Cadenza, a short story (!) which is longer still at 3835 decimal places, and has additional constraints.

A song to help you memorize pi up to about 300 digits

Around the circle is pi times d,

But if the area is declared,

Think of the formula π "r" squared.

"Around the circle" is the circumference.

Circumference = π × d (diameter).

Area = π × r(radius) squared.

**Area Of A Circle**(see area of a circle)

Apple pie are square: A = π × r^{2}

Apple pie are round: A = π × r × r

**Circumference Of A Circle** (see circumference of a circle)

Cherry pie delicious!: C = π × d

**Isosceles Triangle** (see isosceles triangle)

Sing this to the tune of "Oh Christmas Tree":

*Oh isosceles, oh isosceles
Two angles have
Equal degrees*

** Oh isosceles, oh isosceles**

You look just like

A Christmas tree

A sentence to help you spell isosceles

I sat on sunny cliff eating lovely egg sandwiches

*(contributed by Margaret and her student)*

**Complementary and Supplementary angle**s

This video shows three methods to help you remember complementary and supplementary angles.

Method 1: In the alphabet, the letter "C" for complementary comes before the letter "S" for supplementary and in the number line 90 comes before 180.

Method 2: A corner is 90-degree angle and a

Method 3: The word complementary has one p, the word supplementary has two p's. We can take one p to represent 90 and two p's to represent 180. Angle Properties (Math Song)

In geometry if you want to fare well

You need to know that parallel lines

They never touch

They're always the same distance apart

It's as if they don't like each other much

And there's only one thing that comes between them

Yes a line that passes right through each of them

It's called the transversal

And it has several angle properties

Just like these

Vertically opposite angles are equal!

Corresponding angles are equal!

Alternate interior angles are equal!

Co-interior angles equal 180

Now before you try some geometry problems

You're gonna need some more knowledge to solve them

So listen closely up to these

Other helpful angle properties

See, angles in a triangle or on a line

Add up to 180 every time

Angles around a point or in a quadrilateral are easy

They always add up to 360

Vertically opposite angles are equal!

Corresponding angles are equal!

Alternate interior angles are equal!

Co-interior angles equal 180

-----

Song and video by Colin Dodds

Learn the 6 major plane shape formulae musically: Square, Rectangle, Triangle, Parallelogram, Rhombus/Kite and Trapezium (Trapezoid).

A song to help you learn the properties of 3-D shapes.

Rotate to landscape screen format on a mobile phone or small tablet to use the **Mathway** widget, a free math problem solver that **answers your questions with step-by-step explanations**.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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