Oh, honey, it looks like you've got yourself a rectangular prism there. To find the surface area, you calculate 2lw + 2lh + 2wh. So, for your dimensions of 7cm, 5cm, and 8cm, the surface area would be 2(75) + 2(78) + 2(5*8) = 10 + 112 + 80 = 202 square centimeters.
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8x5x7=280 add the units so answer is 280cm
The area for a 7cm by 8cm is 56.
If one side of the triangle is 8cm then the other side is 7cm because 0.5*8*7 = 28 square cm
The curved surface area of a cylinder with a height of 8cm and diameter of 10cm is 251.33cm2
work out the tatio