9514 1404 393
Answer:
- vertex: 171°
- central: 9°
- exterior: 9°
Step-by-step explanation:
The central angle is equal to the exterior angle:
360°/n = 360°/42 = 8 4/7° ≈ 9°
The vertex angle is the supplement of this:
180° -8 4/7° = 171 3/7° ≈ 171°
There are two fives in 6,755. The first five is worth 50 because it is in the tens place. The five in the ones place is worth just 5.
Formula= angle/360° x pi r^2
100/360 = 0.27777778
Radius = diameter/2
9.3/2 = 4.65
Pi x 4.65^2 = 67.9290872 (do not round until the end)
0.27777778 x 67.9290872 = 18.869191
This number rounds to 18.9
Hope this helps
-Emiliaatkinson (UK)