Understanding Surface Area and Radius of a Sphere

The video tutorial explains how to find the approximate radius of a sphere given its surface area. It starts by introducing the problem and setting up the equation using the surface area formula. The tutorial then demonstrates solving the equation algebraically to find the radius, emphasizing the importance of not being misled by distractor answers. Finally, it provides the approximate value of the radius, ensuring a clear understanding of the solution process.

What is the problem we are trying to solve in this video?

• Finding the volume of a sphere

• Calculating the diameter of a circle

• Finding the approximate radius of a sphere

• Determining the circumference of a sphere

Tags

CCSS.8.G.C.9

CCSS.HSG.GMD.A.3

What is the formula for the surface area of a sphere?

• πr²

• 4πr²

• 3πr²

• 2πr

What value is substituted for the surface area in the formula?

• 20π

• 40π

• 50π

• 30π

What happens to the pi terms during the algebraic manipulation?

• They are multiplied

• They are added

• They cancel each other out

• They remain unchanged

What is the value of R squared after simplification?

• 20

• 10

• 5

• 15

Tags

CCSS.8.NS.A.2

What is the approximate value of the square root of 10?

• 3.14

• 3.16

• 3.18

• 3.20

Tags

CCSS.HSG.SRT.C.8

Which of the following is a common mistake to avoid?

• Choosing 10 as the radius

• Using the wrong formula

• Forgetting to square the radius

• Multiplying instead of dividing

Tags

CCSS.HSG.SRT.C.8