Lines & Angles — Intro

How the lesson starts: Lines & Angles — Intro

Bolt builds a treehouse
Hi there! Bolt the robot is building a treehouse. Bolt wants every corner nice and square, so nothing wobbles. Let's learn about corners with Bolt!
The square corner
When two straight sides meet, they make a corner, called an angle. Some corners are perfectly square, like the corner of a book. That's a right angle. A square and a rectangle have 4 right angles. A triangle's corners aren't square.
No sides, no corners
Bolt adds a round window. A circle is curvy all the way around. It has no straight sides, so it has no corners and no angles at all! A triangle and a square have both.