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The perimeter of a rhombus with a side of 6 is 24

Consider a cube that has sides of length l. now consider putting the largest sphere you can inside this cube without any point on the sphere lying outside of the cube. the volume ratio -volume of the sphere/ volume of the cube is 1. 5.2 × 10−1 2. 3.8 × 10−1 3. 1.9 4. 2.5 × 10−1 5. 3.8

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16