Question

Three angles of a quadrilateral are 50°, 70° and 100° . What is the measure of fourth angle.​

Answer 1

Let the fourth angle be x.

We know that sum of all angles of a quadrilateral is 360°.

So, 50° + 70° + 100° + x = 360°

220° + x = 360°

x = 360° - 220°

x = 140°

So the fourth angle is 140°...

Answer 2

Let rhe unknown angle be X

The interior angle of quadrilateral is 360⁰

Given angles are 50⁰+70⁰+100⁰+X=360⁰

220⁰+X=360⁰

X=360⁰-220⁰

X=140⁰

The unknown angle is 140⁰

Quadrilateral sum

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