Comparing Familiar Area Formulas

Bianca calculated the height of the equilateral triangle

with side lengths of 10

Calculate the area of the equilateral triangle using the

formula for area of a regular polygon, and compare it to

Bianca's answer.

The apothem, rounded to the nearest tenth, is

units.

The perimeter of the equilateral triangle is units.

Therefore, the area of the equilateral triangle is

vor approximately 43.5 units

The calculated areas are

tan (30) =

n = 8.7

rebo

Then, she used the formula for area of a triangle to

approximate its area, as shown below.

A = 20

= (10) (8.7)

= 43.5 units?

Question

Karissa Campbell

4 September, 14:43

+3

Answers (2)

Know the Answer?

Alyson Hale · Answer 1

Answer: 1. 2.9 units

2. 30 units

3. 1/2 (2.9) (30)

4. the same despite using different formulas

Dangelo Hebert · Answer 2

1. 2.9 units

2. 30 units

3. 1/2 (2.9) (30)

4. the same despite using different formulas