Isosceles triangle
9x + 3 = 84
9x = 81
x = 9
answer
<span>D. 9</span>
Multiply it out. 3*1+3*4t=3+12t
Answer:
144
Step-by-step explanation:
Step 1: Find the sum of interior angles
Formula: 180(n - 2)
180(10 - 2)
180(8)
1440
Step 2: Assuming the 10-sided polygon's angles are all congruent, divide 1440 by 10
1440/10
144 degrees to each angle for all 10 angles.
