What is the area of the composite figure if ab ≅ bc ≅ cd ≅ da ≅ dn?

(2π + 28) mm2
(2π + 32) mm2
(2π + 40) mm2
(2π + 48) mm2

Lets break this down into recognizable shapes (see the figure below). We see we have a semicircle, one square, and a trapezoid. We can find the area of each, then add them all together.

Area of a circle = pi*r^2
pi*2^2
=4pi
We have to remember that this is a semicircle, so we'll divide by two to get 2pi.

Area of a square = s^2
In this case, s=4, so 4^2 = 16

Area of a trapezoid = 1/2(b1+b2)h, where b1 and b2 are bases.
1/2(8+4)(4) = 24

24+16+2pi = (2pi+40) mm^2

:)

First, think of what you know. you know that the number t the end of the equation will need to be subtracted because it is the money he lost from buying the lawn mower. and your first two weeks have negative profit, so that tells you that c and d are wrong. now you can plug any of the weeks into a and b to see which one works. i'll start with plugging week 1 into a.this isn't right because it says your answer for week one should be -90.so now we need to try the same thing with b.this one got you the right answer, (sometimes if you only check with one of the weeks multiple will work so you need to check with more of the weeks, but it worked out fine here)this means that b is the correct answer.let me know if you need more clarification. i hope this : )