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Surface Area and Volume please help guys!

0 votes
A prism has total surface area of 360m^2 and volume of 60m^3

If the length, width, and height are reduced to half their original sizes, what will be the following?

a) the new surface area

b) the new volume

If the length, width, and height of the original are increased to triple their original sizes, what will be the following?

c) the new surface area

d) the new volume

please show work for all
asked Oct 27, 2015 in GEOMETRY by anonymous

4 Answers

0 votes

(1a)

The total surface area of the prism is image.

The length, width and height are reduced to half their original size.

Surface area of the prism is image.

Here image is the base,

image is the height of the base triangle,

image is the perimeter image.

image is the height of the prism.

If the length, width and height are scaled by a factor of image then surface area of the prism is scaled by a factor of image.

Surface area of the prism: image

image

If the length, width, and height are reduced to half their original size then surface area of the prism is image

answered Oct 28, 2015 by Lucy Mentor
0 votes

(1b)

The volume of the prism is image.

The length, width and height are reduced to half their original size.

The length, width and height are scaled by a factor of image.

Volume of the prism is image.

Here image is the base,

image is the height of the triangle and

image is the height of the prism.

If the length, width and height are scaled by a factor of image then volume of the prism is scaled by a factor of image.

Volume of the prism: image

image

If the length, width, and height are reduced to half their original size then surface area of the prism is image.

answered Oct 28, 2015 by Lucy Mentor
0 votes

(1c)

The total surface area of the prism is .

The length, width and height are increased to triple their original size.

Therefore the length, width and height are scaled by a factor of image.

If the length, width and height are scaled by a factor of  then surface area of the prism is scaled by a factor of .

Surface area of the prism:

image

If the length, width, and height are increased to triple their original size then surface area of the prism is image

answered Oct 28, 2015 by Anney Mentor
0 votes

(1d)

The volume of the prism is .

The length, width and height are increased to triple their original size.

Therefore the length, width and height are scaled by a factor of image.

If the length, width and height are scaled by a factor of  then volume of the prism is scaled by a factor of .

Volume of the prism:

image

If the length, width, and height are increased to triple original size then surface area of the prism is image.

answered Oct 28, 2015 by Anney Mentor
edited Oct 28, 2015 by Anney

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