Question

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Answer 1

Answer:

since the exterior angle sum is 360°

Step-by-step explanation:

In ext angle A + int angle A =180° (Linear pair)

= angle 1 + 90° = 180°

angle 1 = 180-90

angke 1= 90°

therefore,

angle A +angle B +angle C +angle D +angle E = 360°

putting the values

90+ 40+ x +60+90 =360°

280+ x = 360

x = 360 -280

x= 80°