Question

An equilateral triangle with side length 20 cm is shown in the diagram, work out the area of the triangle.Give your answer rounded to 1 DP.

Answer 1

173.2 cm²

Explanation:

Use the equilateral triangle area formula, A =
`(√(3))/(4)`a²

Plug in the side length and solve:

A =
`(√(3))/(4)`a²

A =
`(√(3))/(4)`(20)²

A =
`(√(3))/(4)`(400)

A = 173.2

So, the area of the triangle is approximately 173.2 cm²