SOLUTION: A triangle has one angle that measures 69° and one angle that measures 21°. What kind of triangle is it?

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Question 944323: A triangle has one angle that measures 69° and one angle that measures 21°.
What kind of triangle is it?
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
The sum of the angles of a triangle are 180 degrees,
Let X be the unknown angle
69+21+X=180
90+X=180 Subtract 90 from each side
X=90
ANSWER A triangle with a 90 degree angle is by definition a right triangle.