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

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More Geometry Lessons

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?

**Geometry - Introduction to angles**

An explanation of what an angle is.

**Geometry - Finding unknown angles**

An explanation of

- Sum of angles on a straight line
- Sum of angles at a point
- 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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