9 cm x 9 cm x 12 cm is an isosceles triangle with base 12
and height = sqrt(81-36) cm = sqrt(45) cm
So area = 1/2 * base * height = 1/2 * 12 * sqrt(45) = 40.25 cm2
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Fist lets start by reviewing what the area of a pyramid is. Volume of a pyramid (with a rectangular base) is the Area of the Base x Height x 1/3. Where the 1/3 comes in I don't know but that's the equation. So we have a rectangle with the sides measuring 9cm x 12cm. The area of a rectangle is S1 * S2 so we have an area of 9cm*12cm=108cm2. We are given the height (altitude) as 12 cm so now that we know the area of the base, and the height we can find the volume. V= 108cm2 * 12cm *1/3 V= 1296cm3*1/3 V= 432cm3
Area of the rectangle is 144cm. The sides of a square with the same ares is 12cm.
12 x 9 = 108 square centimeters
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Find the area of 5cm 12cm 8cm