Classifying Angles
What type of angle is 45°?
Acute angle
How many degrees are in a full circle?
360 degrees
What kind of triangle has all angles less than 90°?
Acute triangle
What kind of triangle has all equal sides?
Equilateral triangle
What is a right angle?
An angle that measures exactly 90°
What tool do we use to measure angles?
Protractor
A triangle has one 90° angle. What is it called?
Right triangle
What kind of triangle has two equal sides?
Isosceles triangle
What type of angle measures more than 90° but less than 180°?
Obtuse angle
How many degrees are in a right angle?
90 degrees
A triangle has one angle greater than 90°. What kind is it?
Obtuse triangle
What kind of triangle has all different sides?
Scalene triangle
What is an acute angle?
An angle that measures less than 90°
Estimate the angle formed by clock hands at 3:00.
90 degrees
A triangle has three angles that are all 60°. What is it called?
Acute triangle
A triangle has sides 5 cm, 5 cm, and 8 cm. What is it?
Isosceles triangle
Give an example of a real object that shows a right angle.
Answer may vary.
A book corner or a square tile
If an angle is 120°, what type of angle is it?
Obtuse angle
True or False: A triangle can have two right angles.
False
Name 3 real-life objects shaped like triangles.
Answers may vary.
Slice of pizza, yield sign, roof gable