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5.01 Angles of triangles

Interactive practice questions

What is the sum of the measures of the interior angles of any triangle?

The measures add to $\editable{}$ °

Less than a minute

Consider the diagram below.

Consider the diagram below.

Consider the diagram below.

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Prove theorems about triangles. Theorems include: measures of interior angles of a triangle sum to 180°; base angles of isosceles triangle are congruent; the segment joining midpoints of two sides of a triangle is parallel to the third side and half the length; the medians of a triangle meet at a point.

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