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Intro to Angles
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What you will learn from this videoWhat you will learn
- We'll learn what angles are!
- How to identify and measure different types of angles.
- And we’ll discover that this knowledge can help us skateboard, dance, and even enjoy birthday cake!
- Discussion Questions
Before Video
What attribute do you measure when you use a ruler as the measurement tool?ANSWERI am measuring length. Length on a ruler is measured in inches or centimeters.
I am measuring duration, or the amount of time between things.
I am measuring weight.
I know that inches, feet, and meters are used to measure length. Grams, kilograms, and pounds are used for weight. Seconds, minutes, and hours are used for time. Cups, liters, and liquid ounces are used to measure capacity.
I heard the word angle when I was playing baseball. Coach told me to throw the ball at a higher angle.
After Video
What is a degree?ANSWERA degree is a unit of measure for angles. It is equal to [ggfrac]1/360[/ggfrac]th of a circle.
An acute angle is less than 90°, an obtuse angle is between 90° and 180°, and a right angle is equal to 90°.
A rectangle has all 90° angles, which means it has all right angles.
First, I need to make sure that the vertex of the angle is under the hole in the protractor. Next, I need to line one of the straight lines up with the 0° line on the protractor. Then I need to trace along the protractor from 0° until I reach the second ray. The set of numbers that I have counted up from 0° tell me the measure of an angle.
No, an angle's orientation does not affect its size.
- Vocabulary
- Angle DEFINE
The rotational space between two rays connected at a common point.
- Degree DEFINE
A unit of measurement for angles. A full circle measures 360°, so 1° is [ggfrac]1/360[/ggfrac] of a circle.
- Right angle DEFINE
An angle that measures 90°, or one-quarter turn on a circle.
- Acute angle DEFINE
An angle that measures less than 90°.
- Obtuse angle DEFINE
An angle that measures more than 90° and less than 180°.
- Protractor DEFINE
A measurement tool used to measure the angle between two lines (rays).
- Vertex DEFINE
The point where two lines (rays) meet and form an angle.
- Angle DEFINE
- Reading Material
- Practice Word Problems
- Practice Number Problems
- Lesson Plan
- Teacher Guide
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Level 1
How can you measure an angle using a protractor?
Level 2
What is the difference between an acute angle, a right angle, and an obtuse angle?
Level 3
A 120° angle is divided into two smaller angles. If we know that one of the angles measures 70°, what is the measure of the other angle?
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