Question

ABCD is a cyclic quadrilateral <A=(2x-25)° and <C=(5x-5)° , find x​

Answer 1

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In a cyclic quadrilateral,

opposite angles add up to 180°

so,

∠A+∠C=180

2x-25+5x-5=180

7x-30=180

7x=210

x=30

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