A cube of side length 8 cm is intersected by a plane perpendicular to the base as shown.
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.
what shape is it? what is its height?
idk
recangle?
rectangle ?
yes, it's a rectangle, because it has 90 degree angles. what is its height?
looks like the height is the same as the side of the cube.
you can use pythagoras to find the slanted edge that makes the top and bottom.
idk what that is
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.
See http://www.khanacademy.org/math/geometry/triangles/v/introduction-to-the-pythagorean-theorem
But first you have to find the lengths |dw:1343166706703:dw|
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