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4 years ago

11

Please!! I have to do this by tonight!!

1 answer:

Aneli [31]4 years ago

4 0

Answer:

Prob.3

Denote r: radius of circle O

Formula for calculating AOB sector:

Area = pi*r^2*angle/360

Area = pi*r^2*45/360 = 18 pi

=> r^2 = 18*360/45 = 144

=> r = 12

For prob.4, give it a try, follow the formula I gave. Good luck !

(answer : r = 6)

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