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Pls answer for both thank you

Pls answer for both thank you-example-1
User Metroids
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Answer:

17. 1 = 2 = 45, 3 =135

18. 1 = 2 = 105.5

Explanation:

17.

isosceles trapezoid properties:

Angle 1 = Angle 2

Angle 3 = 135

sum of the angles in any quadrilateral is 360

A1 + A2 + A3 + 135 = 360

A2 + A2 + 135 + 135 = 360

2A2 = 360 - 135 - 135

2A2 = 90

A2 = 90/2 = 45

So

A1 = A2 = 45

18.

Draw straight line from edge at 1 to edge at 2

Now you have two isosceles triangle

isosceles triangle properties:

angles opposite to equal sides are equal in measure

sum of the angles in any triangle is 180

refer photo for calcukation

Pls answer for both thank you-example-1
User CRUTER
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