Question

Find the area of an equilateral triangle that has a perimeter of 21 inches. Round the answer to one decimal place.

Answer 1

this is the triangle

Answer 2

7....area is 1/2(b)(H)

Answer 3

if the perimeter is 21inches.. how long is 1 side of it?

Answer 4

you would have to find the apothem of a regular polygon

Answer 5

then the formula is A=1/2aP

Answer 6

I NEED HELP!!! @aum @BVB4life @IndiiAvery @lxl-rhea-lxl @LearningIsAwesome @tanya123

Answer 7

i think its 7...

Answer 8

if the perimeter is 21inches.. how long is 1 side of it? recall what a perimeter is, check your material

Answer 9

http://www.mathsisfun.com/geometry/perimeter.html

Answer 10

I think the Answer might be 7.. Not sure.

Answer 11

but my A+ program keeps saying it's not 7

Answer 12

21.22in²