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Unit 10 Review Area Formulas

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FOR EACH FIGURE: IMAGINE the shape THINK of its AREA FORMULA

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The “base” of the polygon does not need to be on the bottom!

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! The HEIGHT of the polygon does not need to be vertical!

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The base and height must be PERPENDICULAR to each other!

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RECTANGLE

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A = bh

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The base and height must be perpendicular to each other. h b

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PARALLELOGRAM

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A = bh

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The base and height must be perpendicular to each other. The height can be outside the figure. h b

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SQUARE

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A = s 2 A = bh

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All 4 sides are congruent. A=bh becomes A=s 2 s s

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TRIANGLE

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A =

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The base and height must be perpendicular. base b h

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TRAPEZOID

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A =

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The bases are parallel. b 1 b 2 h

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RHOMBUS

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A =

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Don’t add the diagonals. MULTIPLY the diagonals.

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KITE

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A =

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Don’t add the diagonals. MULTIPLY the diagonals.

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REGULAR POLYGON

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A =

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To find the central angle, divide 360 by the number of sides.

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A = Apothem = a Perimeter = p a

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Bonus: Triangle given SAS

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A =

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a Cb

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Circle Area

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A =

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The radius is half of the diameter. r

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CIRCUMFERENCE

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C = C =

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C = r

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Quick Check:

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Circle Area

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A =

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REGULAR POLYGON

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A =

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TRAPEZOID

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A =

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KITE

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A =

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SQUARE

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A = s 2 A = bh

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PARALLELOGRAM

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A = bh

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CIRCUMFERENCE

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C = C =

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RHOMBUS

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A =

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TRIANGLE

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A =

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RECTANGLE

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A = bh

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Triangle

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