Area of a pyramid? Please help?!

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What is the lateral area of this regular octagonal pyramid?

114.8 cm²
162.4 cm²
229.7 cm²
281.3 cm²

1 Answer
Mark D.
Mar 27, 2018

162.4 #cm^2#

Explanation:

The base is made up of eight congruent triangles. Each triangle has a base of 5.8 cm and a height of 7 cm.
Use Area = #1/2# x base x height and multiply your answer by eight.
A = #1/2# x 5.8 x 7
A = 20.3 #cm^2#
So the whole area is 20.3 x 8 = 162.4 #cm^2#

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