What is the area of a triangle with sides measuring 7 cm, 7.2 cm and 9 cm?

Question

Round to the nearest tenth.

 

Area ≈ __?__ cm².

Answer 1

area = square root of p(p-7)(p-7.2)(p-9) where p= half the perimeter = 23.2/2 = 11.6

it's called "heron's formula" Think of Lake Huron, one of the Great Lakes, only an e not u.

It's for when you know all 3 sides but no angles.

area = square root of 11.6(4.6)(4.4)(2.6) ]

area = square root of about 610

area = about 24.70705162 square centimeters about 25 cm^2