How do you calculate the area of a triangle? To calculate the area of a triangle, multiply the height by the width (this is also known as the 'base') then divide by 2.

A KS3 Bitesize 11-14 Maths guide showing you how to prove the area of a triangle is half base × height.

The mystery became globally known in 1945 when a squadron of American bombers known as Flight 19 disappeared during a ...