Volume and Area NotesArea and Perimeter

Perimeter:

Rectangle:

P = 2w + 2l

Square:

P = 4s

Triangle:

P = x + y + z

Circle:

C = 2πr

Area:

Rectangle:

A = l × w

Square:

A = s2

Triangle:

A = bh

Circle:

A = πr2

Find the perimeter and area for each of the figures shown below:

Ex. 1) Ex. 2)

P = 2(2.5) + 2(6) A = (2.5)(6) P = 4(3) A = (3)(3) 5+12 = 17 cm 15 cm2 12 in 9 in2

Ex. 3) Ex. 4)

P = 9+15+12 A = (.5)(9)(12) C = (2)( )(3)π A = (3)π 2

36 mm 54 mm2 6 cm or 18.85 cm 9 cmπ π 2 or 28.27 cm2

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