Triangle angle sum and the triangle inequality

The three angles add to 180 degrees, and any two sides must add to more than the third.

Standards:7.G.A.28.G.A.5

Try it: three questions

Real questions from the practice bank. Tap an answer to check it.

Question 1 of 3

A triangle has angles of 48° and 67°. What is the measure of the third angle?

Question 2 of 3

A triangle has angles of 48° and 65°. What is the third angle?

Question 3 of 3

A triangle has angles measuring 34° and 71°. Find the measure of the third angle.

How this fits in

Triangle angle sum and the triangle inequality is one skill in the Basic Geometry unit. Students read the unit lesson, then earn a bronze, silver, or gold medal on their last 10 answers. Medals never go down. A mastered unit comes back for review after 1, 3, 7, 16, and 35 days so it stays learned.

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