Exercise 18 Page 845

To calculate the volume of a cone, we can use the following formula. In this formula r is the radius, and h is the height of a cone. V= 13π r^2 h We are given that the height of the cone is 7.3cm and the radius of the base is 4.2cm. Let's substitute these values into the above formula and calculate the volume.

V=1/3π r^2 h

SubstituteII

r= 4.2, h= 7.3

V=1/3π ( 4.2)^2 ( 7.3)

▼

Simplify right-hand side

CalcPow

Calculate power

V=1/3π(17.64)(7.3)

Multiply

Multiply

V=1/3π(128.772)

UseCalc

Use a calculator

V=134.8497...

RoundDec

Round to 1 decimal place(s)

V≈ 134.8

The volume of the cone is approximately 134.8cm^3.