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Mathematics 42 Online
OpenStudy (anonymous):

Spencer has to gift wrap all the surfaces of the poster tube shown. What is the area of the gift wrapping paper that Spencer will need? a. 163.4 square inches b. 113.1 square inches c. 153.4 square inches d. 138.3 square inches

OpenStudy (anonymous):

OpenStudy (anonymous):

Find the surface area. First of the the two circles and the cylindrical side

OpenStudy (anonymous):

We know the diameter is 4 that means the radius is 2 for the circles.

OpenStudy (anonymous):

\[r=2\] for the two circles. We have enough information to find the area of the two circles. Do you know the formula for a circle?

OpenStudy (anonymous):

Yes

OpenStudy (anonymous):

Great can you tell me the area of a circle?

OpenStudy (anonymous):

pi(radius)^2

OpenStudy (anonymous):

great and since we know radius=2\[\pi r^2=\pi2^2\]

OpenStudy (anonymous):

May you just help me quickly with the answer please i'm taking a quiz @Romero

OpenStudy (anonymous):

ok that'll be 12.56

OpenStudy (anonymous):

Sorry man I can't give you the answer. Btw you are taking a quiz I think that might be considered cheating.....:/

OpenStudy (anonymous):

No i need help this is the ONLY question i don't understand @Romero that's why i'm following along with how you're helping me

OpenStudy (anonymous):

great multiply that by 2 because we have two circles.

OpenStudy (anonymous):

Next find the circumference and multiply it by 9. 2 * pi * 2 * 9 and add them all up and you are done

OpenStudy (anonymous):

that'll be 25.12

OpenStudy (anonymous):

so therefor the answer is d.

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