Question

Can some one help me ASAP

Answer 1

17) is D. since triangle MNP is equilateral those two segments are the same length

18)A=πr²
78.5=πr²
78.5/π=r²
24.987=r²
r=4.999 or about 5
diameter is double the radius, our 2(5)=10
c=πd
c=π•10
answer is B