Question

If the measures of the three angles of a quadrilateral are 100ᵒ, 55ᵒ and 65ᵒ, the measure of the remaining angle is?

Answer 1

Answer:

140 degrees.

Step-by-step explanation:

Since, sum all angles of a quadrilateral is 360 degrees.

therefore, 100+55+65+x = 360 degrees

220+x=360

x=360-220=140 degrees

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Answer 2

Answer:

140 degrees

Step-by-step explanation:

Let the unknown angle be x

We know that,

Sum of all angles of quadrilateral = 360 Degrees

x+100+55+65=360 degrees

x+220 = 360 degrees

x = 360-220

x=140 degrees

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