Has a base of 6 cm, and has a semi-perimeter of 11cm. What is the area?

Sq. Rt. 11(11-6)(11-6)(11-6)

Sq. Rt. 11(5)(5)(5)

sq. rt. 11 * sq. rt. 125 =37.1 cm^2

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- Nov 14th 2012, 10:23 AMSoConfused123Check my answer on finding the area of an isoscels triangle?
Has a base of 6 cm, and has a semi-perimeter of 11cm. What is the area?

Sq. Rt. 11(11-6)(11-6)(11-6)

Sq. Rt. 11(5)(5)(5)

sq. rt. 11 * sq. rt. 125 =**37.1 cm^2** - Nov 14th 2012, 10:27 AMskeeterRe: Check my answer on finding the area of an isoscels triangle?
the triangle is not equilateral ...

2x + 6 = 22

x = 8

the sides are 8, 8, and 6 - Nov 14th 2012, 10:32 AMSoConfused123Re: Check my answer on finding the area of an isoscels triangle?
So the answer would be 22.2cm^2 ?

- Nov 14th 2012, 01:17 PMMacstersUndeadRe: Check my answer on finding the area of an isoscels triangle?
Yes.

$\displaystyle \text{area} = \sqrt{s\left(s-a\right)\left(s-b\right)\left(s-c\right)}$

$\displaystyle = \sqrt{11(3)(3)(5)}$

$\displaystyle = 3 * \sqrt{55}$

which is equal to your answer.