Question

please solve this it's urgent
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Answer 1

Step-by-step explanation:

1. Sum of all angels of a quadrilateral = 360

Now

80 + 135 + 70 + x = 360

80 + 205 + x = 360

285 + x = 360

Now x = 360-285

x = 75°

Answer 2

Answer:

Step-by-step explanation:

a) Four angles of a quadrilateral add up to 360 ( Angles sum property)

so,

    80+135+70+x=360

    285+x=360

    x= 360-285

 

    x= 75