Question

see attachment

Answer 1

Find the area of each lateral face of the regular pyramid.

Answer 2

lateral area is the surface area - base area

you need to find the slant height, which needs pythagoras's theorem

the perpendicular height is 11cm from the base edge




so call the slant height s

\[s^2 = 18^2 + 11^2\]

slant height = 21.095 I'll round it to 21.1 cm

the triangles are all identical... find the area of 1 and then multiply by 4

so Area = 1/2 x 22 x 21.1

Area = 232.1cm^2

4 triangles = 4 x 232.1
= 928.4 cm^2

the Lateral area is 928.4 cm^2

I think...