Question

find the fourth angle of a quadrilateral if it's three angles are 98°, 115°and 77°.​

Answer 1

your fourfourth angle is 70°

Answer 2

Answer:

we know that sum of all angle of quadrilateral =360 *

Let the fourth angle be X*

$x + 98 + 115 + 77 = 36 0 \\ x + 290 = 360 \\ x = 360 - 290 \\ x = 70 \: \: ans$

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