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OpenStudy (anonymous):
The shaded area in the diagram below shows the cross section of a pyramid intersected by a plane that passes through the apex and is perpendicular to the base. The base of the pyramid is a square of side 18 cm. Each edge of the triangular faces is 12 cm long. Which is the best approximation of the perimeter of the cross section? 34 cm 42 cm 45 cm 72 cm
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OpenStudy (anonymous):
OpenStudy (anonymous):
I get 33...
OpenStudy (anonymous):
Well, 33.87 which is 34
OpenStudy (anonymous):
me too
OpenStudy (anonymous):
Think of it this way... This is a face of the pyramid: |dw:1343591333229:dw|
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