2 Class Clips

- What is pi?
- Area
- How to prove the area of a triangle is ½ × base × height
- How to show the area of a circle is π × r²
- How to show the surface area of a sphere is 4πr²
- How to prove a cone's surface area = π × r × slant length
- How to prove a cylinder's surface area is (2πr × h) + 2πr²
- How to prove the formula for the area of a trapezium
- How to prove the area of a parallelogram is base × height
- Perimeter
- How to show the circumference of a circle is π x diameter
- Volume
- What is the volume of a cone, a sphere and a cylinder?
- How to prove the volume of a cuboid is base × height × depth
- How to prove the volume of a cone is ⅓ height × πr²

4 Class Clips

3 Class Clips

- What are angles?
- Angles and triangles
- How to use right-angled triangles to solve geometry problems
- How to show the sum of angles in a polygon is (n-2) x 180°
- How to show the angles in a triangle add up to 180°
- Intersecting and parallel lines
- How to find missing angles on bisecting lines
- Constructions, loci and three-figure bearings
- How to bisect lines and angles
- How to draw a perfect five-pointed star

3 Class Clips