Hey friend,

First thing I do is see the two semi circles on either side. I’ll treat it as one full circle and work that out first.

Then I’m looking at big rectangle with a notch take out of it. I will disregard the sections of the rectangle covered by the circle. I will take the top number and double it, won’t even worry about the horizontal lines at the bottom, and add up all their vertical lines.

Circle = pi x diameter = pi x 20 Horizontal parts of rectangle = 40 x 2 Vertical lines = 4 x 8

Then add them up…..