If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains ***.kastatic.org** and ***.kasandbox.org** are unblocked.

Main content

Learn

No videos or articles available in this lesson

Practice

Identify medians and altitudesGet 3 of 4 questions to level up!

Practice

Understand triangle exterior angle propertyGet 3 of 4 questions to level up!

Triangle exterior angle property problemsGet 3 of 4 questions to level up!

Learn

Practice

Find angles in trianglesGet 5 of 7 questions to level up!

Finding angle measures using trianglesGet 5 of 7 questions to level up!

Practice

Find angles in isosceles trianglesGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 600 Mastery points

Practice

Triangle side length rules Get 3 of 4 questions to level up!

Learn

Practice

Use Pythagorean theorem to find right triangle side lengthsGet 5 of 7 questions to level up!

Right triangle side lengthsGet 3 of 4 questions to level up!

Use area of squares to visualize Pythagorean theoremGet 3 of 4 questions to level up!

Up next for you:#### Unit test

Level up on all the skills in this unit and collect up to 1000 Mastery points!