 # Unit 10 Review Area Formulas. FOR EACH FIGURE: IMAGINE the shape THINK of its AREA FORMULA.

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Unit 10 Review Area Formulas

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

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

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

The base and height must be PERPENDICULAR to each other!

RECTANGLE

A = bh

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

PARALLELOGRAM

A = bh

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

SQUARE

A = s 2 A = bh

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

TRIANGLE

A =

The base and height must be perpendicular. base b h

TRAPEZOID

A =

The bases are parallel. b 1 b 2 h

RHOMBUS

A =

Don’t add the diagonals. MULTIPLY the diagonals.

KITE

A =

Don’t add the diagonals. MULTIPLY the diagonals.

REGULAR POLYGON

A =

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

A = Apothem = a Perimeter = p a

Bonus: Triangle given SAS

A =

a Cb

Circle Area

A =

The radius is half of the diameter. r

CIRCUMFERENCE

C = C =

C = r

Quick Check:

Circle Area

A =

REGULAR POLYGON

A =

TRAPEZOID

A =

KITE

A =

SQUARE

A = s 2 A = bh

PARALLELOGRAM

A = bh

CIRCUMFERENCE

C = C =

RHOMBUS

A =

TRIANGLE

A =

RECTANGLE

A = bh

Triangle

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