Pls help... The top of an office desk is in the shape of a semicircle, as shown in the figure below.

Based on the dimension given in the figure, which
of the following is closest to the area of the top of the office desk? (Use 3.14 for pi)

πr2/2 is your area of semicircle but you need to know it's radius

we know that

applying the law of sines

°

so

∠j=18°

∠k=29°

∠l=180-(18+29)=133°

the answer part a) is

the measure of angle k is  ≈29°

part b)  the measure of angle k could also be

(180-29)=151°

so

∠j=18°

∠k=151°

∠l=180-(18+151)=11°

the answer part b) is

the measure of angle k could also be 151°

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the 2 figures are congruent bc if you reflect abcd over the y axis then over the d axis the figures overlap