Question

The angles in a triangle are represented by 5x, 8x, and 2x+9. What is the value of ?

A.10.8
B.11.4
C.9.7
D.7.2

Answer 1

11.4

Explanation:

Add 5+8+2

You get 15

So 15x

Then subtract 9 from 180.

180 minus 9 is 171

Divide by 15

You get 11.4

Answer 2

B.11.4

Explanation:

The sum the 3 angles of a triangle add to 180 degrees

5x+8x+2x+9 = 180

15x+9 =180

Subtract 9 from each side

15x+9-9 =180-9

15x = 171

Divide by 15

15x/15 =171/15

x =11.4