Question

What is the perimeter of the figure to the nearest hundredth of a centimeter?



A.
24.56 cm

B.
18.28 cm

C.
16 cm

D.
14.28 cm



http://static.k12.com/calms_media/media/1419000_1419500/1419360/1/b69e6f0436c6372513cf1e14b305f60a42b76b33/MS_PA_130922_171132.jpg

Answer 1

Ok, to begin, we need to find the perimeter of the square. Do you know the formula for perimeter of a square?

Answer 2

no :o

Answer 3

Ok, no problem. Perimeter of a square is the length of one side times 4. So, what is the square's perimeter?

Answer 4

my best guess is that it's B

Answer 5

the square it's self is 4 x 4

Answer 6

16

Answer 7

Correct. Now we must take into account the fact that one of it's sides is not going to be counted as part of the perimeter. So, knowing that one side is equal to 4 cm, subtract that from the square's perimeter.

Answer 8

Linn?

Answer 9

16-4 rioght?

Answer 10

Yep. I know it's trivial, but what is it?

Answer 11

12

Answer 12

Correct. Now, keeping that in mind, we'll move to the semi-circle's perimeter (or Circumference, as it's called in circles). Knowing that a circle's C is equal to 2(pie)r, let's find what r is. So, in the figure, what is r? What does it represent?

Answer 13

@linn99123

Answer 14

radius?

Answer 15

Correct. And what is r, in relation to the diameter of the figure?

Answer 16

i dont know :o

Answer 17

Ok, think of it this way. If the diameter is the whole length across the interior of the circle, and radius is half of that, what is r?

Answer 18

Hint: Use the side of the square we're ignoring to find P.

Answer 19

@linn99123