Tasks 1 The height of a regular quadrilateral pyramid is H = 9cm, and the base edge is a = 12cm. Calculate the area of the %3D %3D parallel section which is at a distance r = 3cm from the top. 2 The area of the base of a pyramid is 150 cm, the area of a parallel section is 54 cm, and the distance between them is 14 cm. Calculate the height of the pyramid date. 13 A triangular pyramid with base edges b cm, 11 cm and 15 cm 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 edge 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. %3D

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