Obtuse angle

An Obtuse Angle is like a BIG, WIDE angle - imagine a slice of watermelon or a wide-open book!

What Makes an Obtuse Angle Special?

• It's bigger than 90 degrees

• Looks like the lines are spreading out really wide

• More open than a right angle

• Less open than a flat line

Fun Ways to Think About Obtuse Angles:

• Picture a pizza slice that's been cut SUPER wide

• The space between a penguin's open beak

• When you open a book more than halfway

• Your arm and body when you're stretching really big

How to Spot an Obtuse Angle:

• If you think of a clock, it would be more space than between 12 and 2 o'clock

• Looks like the lines are getting lazy and falling apart

• Bigger and wider than a right angle (which looks like a perfect corner)

Playful Activities:

1. Use your arms to make an obtuse angle

2. Draw big, wide angles on paper

3. Look around your room and find obtuse angles

   • Open doors

   • Some chair backs

   • Parts of furniture

Measuring Tip:

• Use a protractor

• An obtuse angle is always between 90 and 180 degrees