Ahemispherical wooden bowl has an internal radius of 8cm and an external radius of 9cm
calculate the volume of the wood

Step-by-step explanation:

We have a hemisphere with a radius 9 cm with a hemisphere cut out with radius 8cm.

Calculate a volume of a larger hemisphere and subtract from it a volume of smaller hemisphere.

The formula of a volume of a sphere:

R - radius

Therefore the formula of a volume of a hemisphere:

The volume of the larger hemisphere:

The volume of the smaller hemisphere:

The volume of wood:

Substitute:

454.5 cm³

Step-by-step explanation:

The volume (V) of a sphere is calculated using formula

V= πr³ ← r is the radius

Thus the volume (V) of a hemisphere is

V = × πr³ = πr³

= -

                               = π × 9³ - π × 8³

                              = π (9³ - 8³)

                             = π (729 - 512 )

                            = π × 217 ≈ 454.5 cm³

answer: no

step-by-step explanation:

you are only given the cost not the amount of pounds.

option: d is the correct answer.

d) none of the above.

step-by-step explanation:

clearly from the figure attached to the question we could see that there is no shape given. hence without any shape given in the figure and after rotation we can't obtained a square pyramid.

since, to obtain a image we need a proper figure of the pre-image so that it can be transformed.

hence, the correct answer is:

d) none of the above.

step-by-step explanation: