Mon Prof Augmenté
Acute Right and Obtuse Angles
Three pipe cleaners are bent and placed side by side. The narrow bend is an acute angle, the L-shaped bend is a right angle, and the wide bend is an obtuse angle.
This picture is part of the full library
Every lesson is open to everyone for 7 days after it is published. This one came out on September 13, 2026: its text stays readable here, and its picture opens with a subscription.
The app is free. A subscription opens every lesson, in every school year.
Age 9: open this week
Browse Age 9
In the picture
- Badge 1 sits on the bend of the left pipe cleaner, where the opening is narrow.
- Badge 2 sits on the bend of the middle pipe cleaner, where the shape is an L.
- Badge 3 sits on the bend of the right pipe cleaner, where the opening is wide.
Examples
- The tip of a pizza slice is an acute angle.
- The corner of a window is a right angle.
Key takeaways
- Acute angles are smaller than a right angle.
- Obtuse angles are larger than a right angle.
Carry on in the app
Three questions on this lesson. It has left the free week, so its quiz is for subscribers.
At least one new illustrated lesson every weekday for your child’s year, with its quiz and a reminder at 6:15 pm.
Get the app
Free app, optional subscription
App Store Google Play
