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what is the slant height of a pyramid with surface area of 209 square centimeters and a square base with sides of 7 centimeters? round to the nearest tenth.​

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Answer:

Step-by-step explanation:

base b = 7

slant height = L

area of base = 49 cm²

lateral area = surface area - base area = 209 - 49 = 160 cm²

area of one lateral face = 160/4 = 40 cm²

½·b·L = 40

L = 80/7 ≅ 11.4 cm

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