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## Question

secondary 3 | E Maths

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how to find x！！helppp

58° = 2 x ECD

ECD = 58° ÷ 2 = 29°

ABCE is a cyclic quadrilateral.

So EAB + ECB = 180° (opposite angles of a cyclic quadrilateral add up to 180)

ECB = 180° - 100° = 80°

x = ECD + ECB = 80° + 29° = 109°

Since EAB is 100 deg, ECB is 180 - 100 = 80 deg.

Add this to J’s answer.

EDIT: J has since included this 80 degrees. Final answer is 109 degrees.

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