PLEASE HELP DON'T ANSWER THE QUESTION IF YOU DON'T KNOW THE ANSWER 1. The height of a regular quadrilateral pyramid H=9cm, and the base edge is a=12c. Calculate the area of the parallel section which is at a distance r=3cm from the top.

2. The area of the base of a pyramid is 150cm, the area of a parallel section is 54cm, and the distance between them is 14cm. Calculate the height of the pyramid

3. A triangular pyramid with base edges b cm, 11cm and 15cm is intersected by a plane parallel to the base and passing through the middle of the height. Calculate the area of the intersection.

4. The base of a regular hexagonal pyramid is a = 5cm, and the side edge with the plane of the base occupies an angle of 60°. Calculate the area of the largest Diagonal section.

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