Question

Three angles of a quadrilateral are 60 degree, 110 degree and 86 degree. What is the measure of the fourth quadrilateral?

Answer 1

Every quadrilateral must have interior angles adding up to exactly 360 degrees.

Therefore, to find the missing measure, simply add up the other angles and see what degree you need for all the angles to add up to 360 degrees.

110 + 60 + 86 = 256

360 - 256 = 104

Answer 2

since, the sum of all angles of quadrilateral is 360℃
let the measure of 4th angle be x°
a/q 60°+110°+86°+x° = 360°
=>256 °+ x° = 360°
=> x° = 360°-256°
=>x° = 104°

hence, the measure of 4th angle is 104°

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