i The angle sum of a triangle - proof and exercises (8th grade math)

Get Math Mammoth DIGITAL bundles at 40% off at Homeschool Buyers Club! Offer valid through March 31, 2025.

^

The angle sum of a triangle - proof and exercises (8th grade math)

See a simple way to prove that the angle sum in a triangle is 180 degrees. After the proof, we also look at two exercises: one with an unknown angle, and another that leads to an equation to solve.

See also

Exterior angles of a triangle — video lesson

Math Mammoth Grade 8 curriculum

Back to the list of 8th grade videos

Back to the index of all videos

WAIT!

Receive my monthly collection of math tips & resources directly in your inbox — and get a FREE Math Mammoth book!

We respect your email privacy.
You can unsubscribe at any time.