So to calculate the area of a triangle, you can work out the area of the rectangle and then divide by 2. The formula for working out the area of a right-angled triangle is: b a s e × h e i g h t 2 ...

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. Find the area of a triangle where height = 5 cm and ...