Question

GIVING MEDAL
find the area of the triangle with a=4ft, b=8ft and c=11ft
a. 12.3ft^2
b. 9.3ft^2
c. 14.3ft^2
d. 13.3ft^2

Answer 1

http://www.youtube.com/watch?v=-YI6UC4qVEY

Answer 2

you need heron's formula for the area of a triangle when given 3 sides

you need to find a value s which is

\[s = \frac{a + b+c}{2}\]

you have a = 4, b = 8 and c = 11

then after finding s

the area is

\[A = \sqrt{s \times(s -a)\times(s -b) \times (s -c)}\]

just substitute and the calculate the answer.

Answer 3

here is a link to explain it

http://www.mathopenref.com/heronsformula.html

Answer 4

i never learned that