Angles: Right, Acute, and Obtuse
Name: _______________________________
Date: _______________________________
Remember: A right angle is exactly 90°. An acute angle is less than 90°. An obtuse angle is between 90° and 180°.
Part 1: Identify the Angles
Look at each angle below. Write whether it is right, acute, or obtuse.
a) ______________
b) ______________
c) ______________
Part 2: Angles in Shapes
Look at the marked angles in each shape. Classify each one.
↖
d) Corner of square: ______________
↓
e) Bottom angle of triangle: ______________
Part 3: True or False
Write T for True or F for False.
f) ____ A right angle looks like the corner of a book.
g) ____ An obtuse angle is smaller than a right angle.
h) ____ An acute angle is less than 90°.
i) ____ All corners of a rectangle are right angles.
j) ____ An angle that is 120° is an acute angle.
Part 4: Challenge
Draw one example of each type of angle in the boxes below.
Right Angle
Acute Angle
Obtuse Angle