Question

The measures of three angles of a quadrilateral are 80, 90, and 103 degrees. Find the measure of the fourth angle.

67
77
87
97

Answer 1

@SpooksDF
@Gralwyn

Answer 2

the sum of the interior angles of a quadrilateral is 360 degrees

Answer 3

so, 360 = 80 + 90 + 103 + x

Answer 4

solve for x

Answer 5

The angles need to add up to 360 since a quadrilateral had 4 90 degree angles.
So 80 + 90 + 103 + x = 360
273 + x = 360
Solve for X by subtracting 273 from both sides:
x = 360 - 273

Answer 6

So x = 87

Answer 7

thnx:)