Area and perimeter formulas flashcards

Question 1

State the perimeter formula for a rectangle with length $l$ and width $w$.

Accepted Answer

$$P = 2l + 2w = 2(l+w)$$
$P$ is perimeter, $l$ is length, and $w$ is width.

Question 2

State the area formula for a parallelogram with base $b$ and height $h$.

Accepted Answer

$$A = bh$$
$A$ is area, $b$ is the base length, and $h$ is the perpendicular height between the parallel sides.

Question 3

State the area formula for a regular polygon with perimeter $P$ and apothem $a$.

Accepted Answer

$$A = \frac{1}{2}aP$$
$A$ is area, $a$ is the apothem (distance from center to a side), and $P$ is the polygon’s perimeter.

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