In Isosceles Trapezoid QRST, find the measure of < R.
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Step-by-step explanation:
According to the property of Trapezoid,
The lower base angles are congruent,
therefore,
(9x - 17) =(4x+28)
9x-4x = 28 + 17
5x = 45
x = 45/5
x =9
measure of angle R = 4x + 28
= 4(9) + 28
= 36 + 28
R = 64
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