Extra: The puzzle presented in this activity is called a “perimeter magic triangle of order three.” To extend it to a higher-order perimeter magic triangle start by drawing a new triangle.

GCSE Maths Geometry and measure learning ... The perimeter of a 2D shape is the total distance ... Pythagoras’ theorem can be used to calculate the length of any side in a right-angled triangle.

10 basic math formulas in geometry that CBSE class 10 ... Formula for Perimeter of Square. ... (Where c is the hypotenuse, and a and b are the other two sides of a right-angled triangle) ...

Narrator: Using what you know about Geometry and following the Rules, there are other neat things you can work out. For example, the area of a right angled triangle. Here’s one.