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adumaru
here is the answer for ur question.....
Ver imagen adumaru
Ver imagen adumaru
Ver imagen adumaru
Ver imagen adumaru
jamiexx
for the rectangle, it's (length + width) x2
therefore will be (11+w)2 = 40
= 22 + 2w = 40
2w=18
w=9

same for the other rectangle,
(10+4)x2
p=28

equilateral triangle is means all the sides r same with same angles,
so is perimeter/ 3
=30/3
=10