Answer: 40
Step-by-step explanation:
Answer:

Step-by-step explanation:
First, expand the original equation:
(x + 1)(2x + 3)

Now simplify:

And that's your answer!
Sense the two triangles are congruent you would use CPCTC.
Does this help? If it doesn't i can try to explain more if you want.
Step-by-step explanation:
do 21×3.14= 65.94
then divide by 2 since its a semicircle
equals: 32.97
than find perimeter altogether
21+28+28+32.97= 109.97ft