The sides of triangle abc are 4.5feet 7.5 ft and 9 ft. the area is about 17 square feet. explain how to use the are of triangle abc to find the area of a triangle def with side lengths of 6 ft 10 ft and 12ft. you

In order to get the area of a triangle using sides, the formula that we are going to use is Heron's formula. This is after from "Hero of Alexandria".
So here is the step by step process:
First, we calculate for s (half of the triangles perimeter) s = a+b+c divided by 2.
s = 6 + 10 + 12 / 2
s =28/2
s = 14
Now that we have the s, we can now calculate for the area.
A = square root of s(s-a)(s-b)(s-c)
A= square root of 14 x 8 x 4 x 2
A= square root of 896
A = 29.93
The area of triangle DEF is 29.93 square feet or 30 square feet. Hope this answer helps. 

r   = 2.65m

good luck!

cutie~