Learn about angles in triangles and quadrilaterals with this BBC Bitesize Maths article. For students between the ages of 11 and 14.

Isosceles ΔABC is constructed so that AB = AC = 5. Use this tool to investigate the relationship between the area of the triangle and the length of its base (BC). Understand that by similarity, side ...

An isosceles triangle will have two angles the same size. In an equilateral triangle, all angles will be 60°. A right-angled triangle will have one angle that is 90°, which means the other two ...

Students are often unsure why angles in the same segment of a circle have to be equal. Colin Foster explains how to make it ...

You'll be using Sketch 1 of this file which has three different types of triangles - scalene, isosceles, equilateral. Each triangle type has a different colour (pink for scalene, red for equilateral, ...

Working with Sketch 4 Project Sketch 4 on the screen and ask the students to explore which coloured triangles could fit into the given triangle outlines. For the sketch, all the outlines are made of ...