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

Can you tell me the sum of the internal angles of a quadrilateral? If you don't know, read this:

http://www.bbc.co.uk/schools/gcsebitesize/maths/geometry/polygonsrev4.shtml

Answer 2

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

Add the measures of the three angles you are given and subtract that sum from 360 to find the fourth angle.

Answer 3

So 87?

Answer 4

yeap