Perimeter area for figure 18 , 19 , and 20

Mathematics
Tutor: None Selected Time limit: 1 Day

Apr 20th, 2015

Perimeter for figures:

18) 8cm*2+10cm*2 = 36cm

19) 3.2in*2+9in+4in = 19.4in

20) 2*pi*13cm = 81.68cm

Area for figures:

18) 8cm*10cm = 80cm^2

19) ((9in + 4in)*2in)/2 = 13in^2

20) pi*13cm^2 = 530.93in^2

Apr 20th, 2015

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