13. In a triangle, the second angle is twice the first angle and the third angle is 12 degrees less than 5 times the first angle
What is the measure of the largest angle?
A 108°
B. 120°
C. 132°
D. 144°
What is the measure of the largest angle?
A 108°
B. 120°
C. 132°
D. 144°
Add an Answer
More Questions From This User See All
Answers & Comments
Answer:
a. 108°
Step-by-step explanation:
let A = first angle
let B = second angle
let C = third angle
B = 2A
C = 5A - 12
Triangle has a supplementary angle.
A + B + C = 180°
A + 2A + (5A - 12) = 180°
8A = 168°
A = 24°
B = 2(24°) = 48°
C = 5(24°) - 12 = 108°