What attribute do you measure when you use a ruler as the measurement tool?

I am measuring length. Length on a ruler is measured in inches or centimeters.

What attribute do you measure when you use a stopwatch as the measurement tool?

I am measuring duration, or the amount of time between things.

What are some units that you know, and what are they used for?

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.

Have you heard the word "angle" before? What do you think it means? Where did you hear or see it used?

I heard the word angle when I was playing baseball. Coach told me to throw the ball at a higher angle.

A degree is a unit of measure for angles. It is equal to [ggfrac]1/360[/ggfrac]th of a circle.

What is different between an acute angle, an obtuse angle, and a right angle?

An acute angle is less than 90°, an obtuse angle is between 90° and 180°, and a right angle is equal to 90°.

Two-dimensional (2D) shapes can be sorted based on their angle measurements. What kind of angles are in a rectangle?

A rectangle has all 90° angles, which means it has all right angles.

When you measure an angle using a protractor, how do you know what set of numbers to use?

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.

If you change the orientation of two rays, does the size of the angle change?

No, an angle's orientation does not affect its size.

Intro to Angles

Q: What is different between an acute angle, an obtuse angle, and a right angle?

An acute angle is less than 90&deg;, an obtuse angle is between 90&deg; and 180&deg;, and a right angle is equal to 90&deg;.

Q: Two-dimensional (2D) shapes can be sorted based on their angle measurements. What kind of angles are in a rectangle?

A rectangle has all 90&deg; angles, which means it has all right angles.

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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!