If you use metric conversion (shown below), you will find that 9 meters = 90 cm. Tell me if you need further explanation.
R=-6
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Hope this helps you
The general formula of a pyramid with any base is 1/3 bh where b is the area of the base and h is the height. In this case, the height of the pyramid is said to be twice the height of the prism, h. Hence the area becomes 1/3 b*2h or equal to option A. 2/3
