Assuming that by "regular pyramid" you mean that the base is a square.
Area of one of the triangles = (1/2)(18)(15) = 135 cm^2
lateral area = 4(135) = 540 cm^2
total area, I assume you want to add the base area, which is 18^2 or 324 cm^2 to the lateral area
for the volume you need the height of the pyramid
h^2 + 9^2 = 15^2
h = 12 cm
vol = (1/3) base x height
= (1/3)(324)(12) = .... cm^3
PLEASE HELP Find the Lateral Area, Total Area, and Volume of regular pyramid with a base edge of 18cm and a slant height of 15cm round to the nearest tenth
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