Measuring Circular Areas

The area of a circle is calculated using the formula ____.

• A) πr²

• B) 2πr

• C) πd

• D) r²

Why does Sara think there could be a better way of measuring distances?

• The measuring tape is too short

• The measuring tape is too long

• The measuring tape is not accurate

• The measuring tape is difficult to use.

Draw a start line 1 inch and another start line ___ inches from one end of the plank.

• A) 10

• B) 15

• C) 20

• D) 25

What is the purpose of using the scale in the experiment?

• To measure the weight of the car

• To measure the distance the car travels

• To measure the speed of the car

• To measure the height of the ramp.

The experiment involves predicting how far the car will roll down from the two different ______.

• Ramps

• Start lines

• Cars

• Scales

The scale is used to measure how far the car ______.

• A) Weighs

• B) Travels

• C) Speeds

• D) Stops

What is the first step in the experiment according to the instructions?

• Mark the predictions

• Use the scale

• Predict the distance

• Roll the car.