Question

The three interior angles of a quadrilateral are 55°, 65° and 100° respectively. Find the measure of the fourth angle.

Answer 1

Answer:

140

Step-by-step explanation:

55+65+100=220

angle sum property of quadrilateral is 360

360-220=140

Answer 2

Answer:

Sum of angles of quadrilateral is 360°

Step-by-step explanation:

Let fourth angle be x.

so,

55°+65°+100°+x=360°

220°+x=360°

therefore,

x=140°

ans... fourth angle of the quadrilateral is 140°

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