Question

in a square find value x
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Answer 1

angle b is 45° (90/2)

angle opposite to a&b is 85°(verticaly opposite)

let angle beside X be a

a = 180 - (85+45)

= 180- 130

= 50°

x + 50 = 180 ( angles on a straight line)

x= 180 - 50

x= 130°

or

x = 130°( sum of interior angles is equal to exterior angle)