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Mathematics 23 Online
OpenStudy (anonymous):

A cube of side length 8 cm is intersected by a plane perpendicular to the base as shown.

OpenStudy (anonymous):

Part 1: Describe the shape of the cross section formed by the cube and the intersecting plane. Part 2: Find the perimeter of the cross section. Show your work.

OpenStudy (anonymous):

OpenStudy (phi):

what shape is it? what is its height?

OpenStudy (anonymous):

idk

OpenStudy (anonymous):

recangle?

OpenStudy (anonymous):

rectangle ?

OpenStudy (phi):

yes, it's a rectangle, because it has 90 degree angles. what is its height?

OpenStudy (phi):

looks like the height is the same as the side of the cube.

OpenStudy (phi):

you can use pythagoras to find the slanted edge that makes the top and bottom.

OpenStudy (anonymous):

idk what that is

OpenStudy (phi):

you should know a^2 + b^2 = c^2 a, b legs, c the hypotenuse of a right triangle. very famous, thousands of years old, very important.

OpenStudy (phi):

But first you have to find the lengths |dw:1343166706703:dw|

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