Question

Find the surface area of the given composite object, 40mm 60mm 60mm 80mm 10mm

Answer 1

Let us find the area of some parts and then sum them.

First part: 3 Rectangles of length 20 mm and width 10 mm

A= 3*l*w (A:area of 2 rectangles, l:side length)

A= 2*(10)^2 mm^2 (Replacing)

A=2*100 mm^2 ( Raising 10 to the power of 2)

A= 200 mm^2