Question

find the fourth angle of a quadrilateral if its three angle are 98°,115°,77°
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Answer 1

Answer:

Fourth Angle is 70°

Step-by-step explanation:

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Answer 2

Answer:

answer is 70°

Step-by-step explanation:

let∠A= 98°,

    ∠B= 115°,

    ∠C= 177°,

    ∠D= ?

Wekn know that sum of all angles pf quadrilateral is 360°

∴∠A + ∠B + ∠C + ∠D = 360°

98° + 115° + 77° + ∠D = 360° (Substituing Values given)

290° + ∠D = 360°

∠D = 360° - 230°

∴ ∠D = 70°

∴The fouth angle is of 70°