The triangle must be isosceles, due to the perpendicular bisector. Therefore, the expression 20 - 15 can be used to yield an answer of B. 5.
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Answer:
x ≈ 50.76
Step-by-step explanation:
Sin72º = 
200Sin72º
x ≈ 50.76
Hope this is helpful :')
It’s either a or c I’m not real sure