Question
ABCD is cyclic quadrilateral in which A = 72º and B =
105º What is the difference between the measures of C and D?Solution
The sum of opposite angles of a cyclic quadrilateral is 180 o .
So, ∠A + ∠D = ∠B + ∠C = 180 o
Or, 72 o + ∠D = 105 o + ∠C
So, ∠D – ∠C = 105 o – 72 o = 33 o
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