Chapter Review
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Notice that for a kite the diagonals are perpendicular.
m∠1 =90
m∠2 =45
Let's find the measures of the numbered angles one at a time.
Before we begin, let's name the vertices of our kite. We will call it quadrilateral ABCD. The angle that forms a linear pair with ∠1 we will label M.
We have a triangle with the angles ∠M, ∠2, and the angle with measure 65. By the Triangle Angle-Sum Theorem we know that the measures of the angles add to 180. 45+ m∠M+m∠2=180 Since ∠M is formed by the diagonals it is right and its measure is 90. Let's substitute 90 for m∠M and solve the equation.