Question

An equilateral triangle has a side length of 16 cm work out the area of the triangle.

Answer 1

Answer:

128cm²

Step-by-step explanation:

A=½×b×h

A=½×16cm×16cm

A=½×256cm²

A=128cm²

Answer 2

Answer:

110.9 cm²

Step-by-step explanation:

The area (A) of an equilateral triangle is calculated as

A = $\frac{s^2\sqrt{3} }{4}$  ( s is the side length )

Here s = 16, thus

A = $\frac{16^2\sqrt{3} }{4}$

   = $\frac{256\sqrt{3} }{4}$ = 64$\sqrt{3}$ ≈ 110.9 cm² ( to 1 dec. place )