B, 50. because the triangle next to it is the exact same thing.
Answer:
looks like C is best guess
B - 63 Degrees, obviously because all angles add up to a sum of 180 degrees.
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➷ The formula for circumference is ![\pi d](https://tex.z-dn.net/?f=%5Cpi%20d)
1) ![\pi d = 31.4](https://tex.z-dn.net/?f=%5Cpi%20d%20%3D%2031.4)
Divide both sides by ![\pi](https://tex.z-dn.net/?f=%5Cpi)
d = 9.99 (consider this to be 10)
Half this to find the radius
10/2 = 5
It would be figure B.
2) ![\pi d = 37.68](https://tex.z-dn.net/?f=%5Cpi%20d%20%3D%2037.68)
Divide both sides by
:
d = 11.99 (consider this to be 12)
Divide by 2 to find the radius:
12/2 = 6
It would be figure C.
3) area = ![\pi r^2](https://tex.z-dn.net/?f=%5Cpi%20r%5E2)
![\pi r^2 = 153.86](https://tex.z-dn.net/?f=%5Cpi%20r%5E2%20%3D%20153.86)
r^2 = 48.97515909
r = 6.998 (consider this to be 7)
It would be figure D
4) ![\pi r^2 = 113.04](https://tex.z-dn.net/?f=%5Cpi%20r%5E2%20%3D%20113.04)
r^2 = 35.98174
r = 5.998 (consider this to be 6)
It would be figure C.
5) radius = diameter / 2
radius = 3
![\pi (3)^2 = 28.27433](https://tex.z-dn.net/?f=%5Cpi%20%283%29%5E2%20%3D%2028.27433)
It would be option C
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➶ Hope This Helps You!
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