Intro to Area of Circles

The space contained inside of a circle is called the...

• radius

• diameter

• circumference

• area

If a circle has a diameter of 10 ft. then which statement is true?

• The radius is 5 ft. 

•  The diameter is 5 ft

• The radius is 20 ft.

• The diameter is 20 ft.

What does this π mean?

• it's just the letter R

• pi = 3.14

• It's the letter R in cursive

• radius

What is the Area Formula for a Circle?

• A = $\pi$ * r * r

• A = $\pi$ * d

• A = 2 * $\pi$ * r

Find the area of the quarter circle. Round you answer to the nearest hundredth.

• 58.88

• 78.50

• 7.85

• 157.00

A lawn sprinkler sprays water 5 feet in every direction as it rotates. What is the area of the sprinkled lawn?

• 31.4 square feet

• 15.7 square feet

• 19.63 square feet

• 78.5 square feet

What is the formula to find the area of a circle? ​ (a)  

A baker is making a giant pizza with a diameter of 42 inches. a large jar of tomato sauce can cover 90 square inches of pizza. How many jars of tomato sauce does the baker need to buy to cover all the pizza?

Mathematical Equivalence

ON

CHOOSE THE EQUATION THAT YOU WOULD USE TO SOLVE:

Find the area of circle F.

• 
• 
• 
• 

Select the correct formula for finding area of a circle

• l x w

• b x h