The answer is the third choice
Answer:
C
Step-by-step explanation:
the ratios of corresponding sides are in proportion
that is the outer triangle and the inner triangle
= = 2 ( multiply both sides by 30 to clear the fraction )
x = 30 × 2 = 60
4n - 2 + 90 + 3n + 8 = 180
7n + 96 = 180
7n = 84
n = 12