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The length of the radius of the sphere ...

The length of the radius of the sphere
`x^(2)+y^(2)+z^(2)+2x-4y=10` is

A

3.16

B

3.38

C

3.46

D

3.87

Text Solution

Verified by Experts

The correct Answer is:
D
Complete the square in x and `y:(x^(2)+2x+1)+(y^(2)-4y+4)+z^(2)=10+1+4,` so `(x+1)^(2)+(y-2)^(2)+z^(2)=15`. Therefore, `r=sqrt(15)~~3.87`.
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  16. In triangleABC,a=1,b=4, and angleC=30^(@). The length of c is

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