Question

Hi im slightly confused on this question

Find the area of the triangle.

Heres the answeres and what I put
I am gonna say the picture. left side is 5.5 m right side is 6.9 m and the bottom of the triangle is 4.2 m
A. 6.5 m2 ********
B.11.5 m2
C. 23.1 m2
B. 4.5 m2

Answer 1

look up Heron's Formula ... finds area using the three side lengths

Answer 2

or, use the law of cosines to find angle A, as in
5.5^2 = 6.9^2 + 4.2^2 - 2*6.9*4.2 cosA
A = 52.8°
Now you get
A = 1/2 bc sinA = 1/2 * 6.9 * 4.2 sin52.8° = 11.54

Answer 3

p = 5.5+6.9+4.2 = 16.6.
A = sqrt( p/2*S1/2*S2/2*S3/2),
Be sure to include parenthesis.

Answer 4

ok thanks oobleck