The answer is 13.1
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Answer:
a. 254.34, b. 56.52
Step-by-step explanation:
a. A = πr^2,
A = 3.14(9^2)
A = 3.14*81
A = 254.34
b. C = πd
C = 18*3.14
C = 56.52
Answer:
28 degrees
Step-by-step explanation:
step 1
Find the measure of angle 1
----> by supplementary angles
![m\angle 1=180^o-65^o=115^o](https://tex.z-dn.net/?f=m%5Cangle%201%3D180%5Eo-65%5Eo%3D115%5Eo)
step 2
Find the value of x
----> by corresponding angles
substitute
![(10x+5)^o=115^o](https://tex.z-dn.net/?f=%2810x%2B5%29%5Eo%3D115%5Eo)
![10x=110\\x=11](https://tex.z-dn.net/?f=10x%3D110%5C%5Cx%3D11)
step 3
Find the measure of angle 2
Remember that the sum of the interior angles in any triangle must be equal to 180 degrees
![m\angle 1+m\angle 2+(4x-7)^o=180^o](https://tex.z-dn.net/?f=m%5Cangle%201%2Bm%5Cangle%202%2B%284x-7%29%5Eo%3D180%5Eo)
substitute
![115^o+m\angle 2+(4(11)-7)^o=180^o](https://tex.z-dn.net/?f=115%5Eo%2Bm%5Cangle%202%2B%284%2811%29-7%29%5Eo%3D180%5Eo)
![m\angle 2=180^o-152^o=28^o](https://tex.z-dn.net/?f=m%5Cangle%202%3D180%5Eo-152%5Eo%3D28%5Eo)