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# 10.7: Chapter 10 Review

Difficulty Level: At Grade Created by: CK-12

Keywords, Theorems and Formulas

Perimeter
The distance around a shape. Or, the sum of all the edges of a two-dimensional figure.
Area of a Rectangle
The area of a rectangle is the product of its base (width) and height (length) A=bh\begin{align*}A=bh\end{align*}.
Perimeter of a Rectangle
P=2b+2h\begin{align*}P=2b+2h\end{align*}, where b\begin{align*}b\end{align*} is the base (or width) and h\begin{align*}h\end{align*} is the height (or length).
Perimeter of a Square
P=4s\begin{align*}P=4s\end{align*}
Area of a Square
A=s2\begin{align*}A=s^2\end{align*}
Congruent Areas Postulate
If two figures are congruent, they have the same area.
If a figure is composed of two or more parts that do not overlap each other, then the area of the figure is the sum of the areas of the parts.
Area of a Parallelogram
A=bh\begin{align*}A=bh\end{align*}.
Area of a Triangle
A=12bh\begin{align*}A= \frac{1}{2} bh\end{align*} or A=bh2\begin{align*}A=\frac{bh}{2}\end{align*}
Area of a Trapezoid
The area of a trapezoid with height h\begin{align*}h\end{align*} and bases b1\begin{align*}b_1\end{align*} and b2\begin{align*}b_2\end{align*} is A=12h(b1+b2)\begin{align*}A=\frac{1}{2} h(b_1+b_2)\end{align*}.
Area of a Rhombus
If the diagonals of a rhombus are d1\begin{align*}d_1\end{align*} and d2\begin{align*}d_2\end{align*}, then the area is A=12d1d2\begin{align*}A=\frac{1}{2} d_1 d_2\end{align*}.
Area of a Kite
If the diagonals of a kite are d1\begin{align*}d_1\end{align*} and d2\begin{align*}d_2\end{align*}, then the area is A=12d1d2\begin{align*}A=\frac{1}{2} d_1 d_2\end{align*}.
Area of Similar Polygons Theorem
If the scale factor of the sides of two similar polygons is mn\begin{align*}\frac{m}{n}\end{align*}, then the ratio of the areas would be (mn)2\begin{align*}\left( \frac{m}{n} \right)^2\end{align*}.
π\begin{align*}\pi\end{align*}
The ratio of the circumference of a circle to its diameter.
Circumference
If d\begin{align*}d\end{align*} is the diameter or r\begin{align*}r\end{align*} is the radius of a circle, then C=πd\begin{align*}C=\pi d\end{align*} or C=2πr\begin{align*}C=2 \pi r\end{align*}.
Arc Length
The length of an arc or a portion of a circle’s circumference.
Arc Length Formula
length of ABˆ=mABˆ360πd\begin{align*}\widehat{AB}=\frac{m \widehat{AB}}{360^\circ} \cdot \pi d\end{align*} or mABˆ3602πr\begin{align*}\frac{m \widehat{AB}}{360^\circ} \cdot 2 \pi r\end{align*}
Area of a Circle
If r\begin{align*}r\end{align*} is the radius of a circle, then A=πr2\begin{align*}A=\pi r^2\end{align*}.
Sector of a Circle
The area bounded by two radii and the arc between the endpoints of the radii.
Area of a Sector
If r\begin{align*}r\end{align*} is the radius and ABˆ\begin{align*}\widehat{AB}\end{align*} is the arc bounding a sector, then A=mABˆ360πr2\begin{align*}A= \frac{m\widehat{AB}}{360^\circ} \cdot \pi r^2\end{align*}.
Segment of a Circle
The area of a circle that is bounded by a chord and the arc with the same endpoints as the chord.
Perimeter of a Regular Polygon
If the length of a side is s\begin{align*}s\end{align*} and there are n\begin{align*}n\end{align*} sides in a regular polygon, then the perimeter is P=ns\begin{align*}P=ns\end{align*}.
Apothem
A line segment drawn from the center of a regular polygon to the midpoint of one of its sides.
Area of a Regular Polygon
If there are n\begin{align*}n\end{align*} sides with length s\begin{align*}s\end{align*} in a regular polygon and a\begin{align*}a\end{align*} is the apothem, then A=12asn\begin{align*}A=\frac{1}{2} asn\end{align*} or A=12aP\begin{align*}A=\frac{1}{2} aP\end{align*}, where P\begin{align*}P\end{align*} is the perimeter.

## Review Questions

Find the area and perimeter of the following figures. Round your answers to the nearest hundredth.

1. square
2. rectangle
3. rhombus
4. regular pentagon
5. parallelogram
6. regular dodecagon

1. triangle
2. kite
3. isosceles trapezoid
4. Find the area and circumference of a circle with radius 17.
5. Find the area and circumference of a circle with diameter 30.
6. Two similar rectangles have a scale factor 43\begin{align*}\frac{4}{3}\end{align*}. If the area of the larger rectangle is 96 units2\begin{align*}96 \ units^2\end{align*}, find the area of the smaller rectangle.

Find the area of the following figures. Round your answers to the nearest hundredth.

1. find the shaded area (figure is a rhombus)

## Texas Instruments Resources

In the CK-12 Texas Instruments Geometry FlexBook, there are graphing calculator activities designed to supplement the objectives for some of the lessons in this chapter. See http://www.ck12.org/flexr/chapter/9695.

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