Angle Basics
What is an angle?
An angle is formed when two rays share a common endpoint.
What type of angle is exactly 90 degrees?
A right angle.
What tool do we use to measure angles?
A protractor.
Give an example of a right angle found in the classroom.
The corner of a desk.
What shape has four right angles?
A rectangle.
What is the measure of a right angle?
A right angle measures 90°
What type of angle measures more than 90° but less than 180°
An obtuse angle.
How can you estimate if an angle is acute?
It looks smaller than a right angle.
What angle do you measure when a clock's minute hand moves from 12 to 3?
A right angle (90°).
How many sides does a triangle have?
A triangle has three sides.
What is the sum of the angles in a triangle?
The sum of the angles in a triangle is 180°
What is an angle that measures exactly 0°?
A zero angle.
If you have an angle that measures 120°, is it acute, right, or obtuse?
It is an obtuse angle.
How would you describe the angle made by a folded piece of paper along its diagonal?
It forms two 45° angles.
What is the interior angle measure of a square?
Each interior angle of a square measures 90°.
Define a straight angle.
A straight angle measures 180°
What is an angle that measures exactly 180°?
A straight angle.
What is the first step in using a protractor to measure an angle?
Place the center point of the protractor over the vertex of the angle.
How can you find angles in your body?
By observing the range of motion in joints like elbows and knees.
If a polygon has five sides, what is it called?
A pentagon.
Name the angle that measures less than 90°
An acute angle.
How many degrees are in a complete turn or circle?
A complete turn or circle measures 360°.
How do you know if two angles are complementary?
The two angles add up to 90°.
If you rotate your body to face the opposite direction, how many degrees have you turned?
180°
What is the sum of the interior angles of a hexagon?
The sum of the interior angles of a hexagon is 720°.