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TRIANGLE
a = 3cm
b = 4cm
c = 5cm
PERIMETER
AREA
P = a + b + c
P = 3cm + 4cm + 5cm
P = 12 cm
A = 1/2 (bh), h=a
A = 1/2 (3 cm x 4cm)
A = 1/2 (12 cm2)
A = 6 cm2
SQUARE
PERIMETER
AREA
S = 3in
P = 4s
P = 4 (3 in)
P = 12 in
A = s2
A = (3 in)2
A = 9 in2
RECTANGLE
P = 2l + 2h
A = s2
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PERIMETER
AREA
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TRAPEZOID
P = b1 + b2 + S1 +S2
A = [1/2(h) X (b1 + b2)
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PERIMETER
AREA
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