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Please help me on number 21
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4 votes
Please help me on number 21

Please help me on number 21-example-1
User Hyunbin
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21.   D. is the answer.  Angle Q is 75 degrees.  X=30.  The triangle is an isosceles angle so therefore there are 2 angles are congruent to each other, Angle R and Angle Q.   All three of the angles should add to 180 degrees.
User Vladimir Zalmanek
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