Answers

2014-01-29T21:40:07+08:00
Triangle:
P=L+W+W
L=20 cm
W=15 cm
P=20+15+15=50
so the perimeter of the triangle is 50 cm..

quadrilaterals/square:
P=S+S+S+S
S=20 cm
P=20+20+20+20=80
so the perimeter of the square is 80 cm long..
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