mjchey
Answered

help me wit these 3 questions plz.

A cone has a base radius of 7 centimeters and a height of 21 centimeters.


 


What is the volume of the cone?

A.

28π cm3

B.

49π cm3

C.

147π cm3

D.

343π cm3

help me wit these 3 questions plz. A cone has a base radius of 7 centimeters and a height of 21 centimeters. What is the volume of the cone? A. 28 π cm3 B. 49 π class=
help me wit these 3 questions plz. A cone has a base radius of 7 centimeters and a height of 21 centimeters. What is the volume of the cone? A. 28 π cm3 B. 49 π class=

Verified Answer :

Scryt
  1. Cone

    \(r=7cm\)
    \(h=21cm\)

    \(V= \frac{\pi*r^2*h}{3}=\frac{\pi*7^2*21}{3}=7^2*7*\pi=7^3\pi=343{\pi}cm^3\)

    Answer: D

    2. Cylinder

    \(r=5ft\)
    \(h=16ft\)

    \(V= \pi*r^2*h=\pi*5^2*16=25*16\pi=400\pi ft^3\)

    Answer: A

    3.Pyramid

    In this case it will be

    \(V= \frac{a*b*h}{3}\)

    \(a=9ft\)
    \(b=4ft\)
    \(h=12ft\)

    \(V= \frac{4*9*12}{3}=4*3*12=144 ft^3\)

    Answer: B

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