Area of Circles and Squares

To find the area of a rectangle you multiply the length times the width using the formula A = lw. What is the area of this rectangle?

• 8cm

• 15cm

• 15cm²

• 16cm

Here is a square. You can find the area by squaring the length of one side using the formula A = s². What is the area of this figure?

• 100cm²

• 100cm

• 20cm

• 200cm

A rectangle is 4m long and 3m wide. What is the area?

• 7m²

• 12m²

• 14m²

• 14m

How would you find the area of the pink model?

• Add 4 and 3
• Multiply 4 and 3
• Add 4 and 4
• Multiply 4 and 4

How do you find the area of a rectangle?

• Length + Length + Length + Length
• Length + Width
• Length x Width
• Width x Width

_{The radius is half the distance across the center of a circle. The diameter is the distance all the way across the center of a circle. If this circle's radius is 5 inches, what is the diameter of this circle?}

• 5 in

• 10 in

• 3.14 in

• 15.84 in

What is the radius of this circle? (The radius is half the diameter.)

• 18

• 10

• 9

• 8

Use the formula A = πr² to find the area of a circle. (The π symbol is the Greek letter "Pi" which we replace with 3.14 to solve circle problems.) First, we square the radius and then multiply by 3.14.

Find the area of this circle. (Watch out....the picture shows the diameter!)

• 62.9 in

• 31.4 in

• 1256 in²

• 314 in²

Area is measured in....

• units squared

• square units

• cubic units

• centimeters

The radius of a circle is 4 inches. Which formula would you use to calculate the circle's area?

• A=π⋅4​^​2

  
  

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• A=2⋅π⋅4

• A=2⋅π⋅8

• A=π⋅3.14