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• Construct a circle through one of the vertices of the longest side going through the angle opposite the longest side (the angle that is the candidate to be the right angle). If this circle is tangent to the side of the triangle, then the angle at the point of tangency is a right angle. If
not, then it’s not a right triangle. Here is an example of a triangle where angle right angle because side is not tangent to the circle centered at with radius :
is not a
7.4 All The Right Angles
Cool Down: 5 minutes
Student Task Statement
Find all of the right angles in the given diagram.
Unit 7 Lesson 7: Tangent Lines
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