Applying the understanding of the area of a circle to solve problems

Brody is going to eat a round lollipop that has a diameter of 8 centimeters. What is the lollipop's area?

What is the area of a circle with a radius of 3.5?

A sundial has a circular base with a diameter of 90 feet as shown in the diagram.

Which measurement in closest to the area of the circular base of the sundial in square feet?

• 3,627.5 ft.²

• 282.6 ft.²

• 141.3 ft.²

• 6,358.5 ft.²

• About 100.48 sq. in.

• About 113.04 sq. in.

• About 125.6 sq. in.

• About 439.6 sq. in.

Find the area of the circle, giving your answer to 1 decimal place.

• 3.1cm²

• 12.6cm²

• 6.3cm²

• 50.3cm²

What is the area of this circle? Use π = 3.

• 30 m²

• 75 m²

• 60 m²

• 100 m²

What is the area of this circle?

Mathematical Equivalence

ON

Formula for the area of a circle

• $A=LW$
  

• $A=\frac{bh}{2}$

• $A=\left(\frac{b_1+b_2}{2}\right)h$

• $A=\pi r^2$

what is the formula for finding the area of a circle?

• 2r

• πr2

• 2πr

Pi ( $\pi$  )  

• 3.14

•  $r^2$