Question

Figure PQR is an equilateral triangle with a semicircle added to its base.

What is the perimeter of figure PQR? Use 3.14 to approximate pi.

http://static.k12.com/calms_media/media/1571000_1571500/1571377/1/f1336369a6581fc513c37a95c47e29ea4b5b2e5f/MS_IMB-1401212-1110905.jpg

______________cm

Answer 1

@inowalst @TheSmartOne @Phebe @KyanTheDoodle @e.mccormick @saifoo.khan

Answer 2

plz help

Answer 3

@TheSmartOne , I forgot the way you did the last question, because this one is just like it, I need u the most. PLZ guide me through or tell me again so that I may remember and right it all down on some paper, plz come, i will medal and fan and testimony u!!!

Answer 4

@Nnesha , plz help as well

Answer 5

ok

Answer 6

so the diameter of the circle is 20cm, circumference is pi*diameter, so a semi-circle is half of that

Answer 7

so (1/2)*3.14*20=31.4cm

Answer 8

so do 3.14 x 20

Answer 9

now what

Answer 10

take half of that 3.14*20 and that is the perimeter of the circle, add 40 and thats your answer

Answer 11

ok

Answer 12

when u say "half", do u mean divide by 2??

Answer 13

@jeweaver6895

Answer 14

is 102.8 the answer

Answer 15

@jeweaver6895

Answer 16

No, 108.8 is not correct.

Take you finger and place it at point P. Now trace the half circle with you finger until you reach point R. The distance you traced with your finger is 31.4 cm. Which you calculate by multiplying pi (3.14) times 20 and then dividing by 2.
So 3.14*20 = 62.8 cm. Now divide 62.8 by 2 = 31.4 cm.

Now continue tracing with you finger starting at point R until you reach point Q. This distance is 20 cm.

So the total distance so far that you traced with your finger is 31. 4 cm + 20 cm= 51.4 cm

Now finish tracing around the figure with your finger by starting at Q and returning to point P. The distance from point Q to point P is also 20 cm.

So the total distance around the figure is 31.4 + 20 + 20 = 71.4 cm.