Intro to Angles

I 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.

A 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.