Question

If a = 12, b = 30, and c = 22, find the area of triangle ABC to the nearest tenth.

Answer 1

p=1/2 the perimeter
\[A=\sqrt{p(p-a)(p-b)(p-c)}\]

Answer 2

i don't follow ...

Answer 3

What is it I posted that you don't understand?

Answer 4

I don't follow the p and the a where did you get the formula from. can you explain a little more in-depth please? :)

Answer 5

It's Heron's formula for the area of a triangle when you know 3 sides. p is half of the perimeter. Do you know what perimeter is?

Answer 6

Yes I do. but I wasn't expecting all that..but thanks.

Answer 7

So find the perimeter and divide it by 2. What do you get?

Answer 8

113.137

Answer 9

12+30+22=64 and 64 divided by 2 is 32. So p = 32. Plug into the formula.

Answer 10

yeah i got 32*20*2*10 then i did square root..

Answer 11

The directions said to round to the nearest tenth so 113.1