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Geometry: Angles and Triangles




 

Videos, worksheets, solutions and activities to help students learn about angles in Singapore Math.

In this lesson, we will learn

  • what is an angle?
  • what are angles on a straight line, angles at a point and vertically opposite angles?
  • what is an isosceles triangle, an equilateral triangle and a right-angled triangle?
  • what is the sum of angles in a triangle?
  • how to draw different types of triangle?
  • how to find unknown angles in a four-sided figure?
  • how to draw a parallelogram, rhombus and trapezium?

Related Topics:
More Geometry Lessons, Singapore Math

Geometry - Introduction to angles
An explanation of what an angle is.
Geometry - Finding unknown angles
An explanation of what are angles on a straight line, angles at a point and vertically opposite angles.



Geometry - Different types of triangles
What is an isosceles triangle, an equilateral triangle and a right-angled triangle?
Geometry - Angle sum of a triangle
Why is the sum of angles of a triangle = 180 degrees?


 
Geometry - Drawing triangles using instruments - Example 1
Learn how to draw an equilateral triangle using geometrical instruments.
Geometry - Drawing triangles using instruments - Example 2
Learn how to draw an isosceles triangle using geometrical instruments.


Geometry - Drawing triangles using instruments - Example 3
Learn how to draw a triangle using geometrical instruments.
Geometry - Finding unknown angles in four-sided figures - Example 1
How do you find unknown angles in a four-sided figure?


 
Geometry - Finding unknown angles in four-sided figures - Example 2
How do you find unknown angles in a four-sided figure?
Geometry - Finding unknown angles in four-sided figures - Example 3
How do you find unknown angles in a four-sided figure?


Geometry - How to draw a parallelogram using instruments.
Geometry - How to draw a rhombus with instruments.


 
Geometry - How to draw trapezium with instruments.

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You can use the free Mathway widget 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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