Geometry: Angles and Triangles
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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