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INfo: Pyramid, Side length = 300 ft, perpendicular height = 321 ft, and slant height = (work shown later)

1. Find the slant height. Round your answer to the nearest whole number.

(slant height)^2 = (height)^2 + (.5(side))^2

= (321)^2 + (150)^2

(slant height)^2 = 125,541

slant height = 354 feet.

Is that correct?

2. Use your previous answer to find the area of the lateral face.

(I'm not sure if I need to use height or slant height, but I used slant height, because when set straight, the slant height is perpendicular to the base. Please correct me if I'm wrong.)

area = .5(base)(height)

= .5(300)(354)

= 53, 100.

My main concern here is whether to use the slant height (354) or height (321) and why...

Thanks for all the help.

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# Lateral Area of a Pyramid

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