What is value of x in 8 sided gon with angle measurements of 136 , 124 , 141, 158, 116, 129, 132

In the surface area formula for cylinders which expressionrepresents the lateral area

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Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.