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B

Step-by-step explanation:

The ratio of the larger figure to the smaller figure is simplfying 30/12 to 5/2

Honest the 7/4 is just an educated guess because...yeah

(sin 42)/31. = sinx)/37

sinx = 37 (sin42)/31

= 37× 0.66/31 = 0.787

x= 51.9

other angle opposite to y = 180-51.9-42

= 180- 93.9 =86.1

so

sin42)/31 = sin 86.1)/y

0.021 = 0.997 /y

y= 0.997/0.021 =47.47

pi x^2

step-by-step explanation:

pi times x squared