Calculating Radius and Diameter from Circle Area

In this video, Tod explains how to find the radius and diameter of a circle when given the area. The process involves using the formula for the area of a circle, which is Pi times the radius squared. The video provides three examples with different units of measurement, demonstrating how to reverse engineer the formula to find the radius and then double it to find the diameter. The video concludes with a call to action to subscribe to the channel.

What is the formula for the area of a circle?

• radius squared / Pi

• 2 * Pi * radius

• Pi * radius

• Pi * radius squared

Tags

CCSS.7.G.B.4

How do you find the radius from the area of a circle?

• Square the area and multiply by Pi

• Divide area by Pi and take the square root

• Add Pi to the area

• Multiply area by Pi

Tags

CCSS.7.G.B.4

How do you calculate the radius squared from the area of a circle?

• Multiply area by Pi

• Divide area by Pi

• Add Pi to the area

• Subtract Pi from the area

Tags

CCSS.7.G.B.4

What is the first step in finding the radius from the area of a circle?

• Divide the area by Pi

• Take the square root of the area

• Subtract Pi from the area

• Multiply the area by Pi

Tags

CCSS.7.G.B.4

If the area of a circle is 255434 square feet, what is the radius?

• 9 feet

• 18 feet

• 81 feet

• 162 feet

Tags

CCSS.7.G.B.4

How is the diameter of a circle related to the radius?

• Diameter is half of the radius

• Diameter is twice the radius

• Diameter is the square of the radius

• Diameter is equal to the radius

Tags

CCSS.7.G.B.4

For a circle with an area of 452.16 square meters, what is the diameter?

• 12 meters

• 24 meters

• 36 meters

• 48 meters

Tags

CCSS.7.G.B.4

If the calculated radius squared is 144, what is the radius?

• 72

• 24

• 288

• 12

Tags

CCSS.7.G.B.4

What is the radius if the area of the circle is 1,256 square inches?

• 10 inches

• 20 inches

• 40 inches

• 30 inches

Tags

CCSS.7.G.B.4

What is the diameter of a circle with a radius of 20 inches?

• 20 inches

• 10 inches

• 80 inches

• 40 inches

Tags

CCSS.7.G.B.4