# Area & Perimeter - Miami-Dade County Public Schools Area Geometry Prep for Algebra 1 Area & Perimeter

Area: the two-dimensional size of a figure Perimeter: The distance around the edge of figure.

Parallelogram Lets Practice 1.

2. Lets Practice

1. If the area is 60 in2 , and the base is 6 in, what is the length of the height? Triangle

Lets Practice Lets Practice

If the area is 32.5 in2, what is the length of the base? Trapezoid

Lets Practice Lets Practice If the area of the trapezoid is 21.25, what is

the length of the second base? Kite MEMORIZE THIS!!!! This formula is not on the

reference sheet. Lets Practice

Circle Use 3.14 for pi. Pi =

Lets Practice Lets Practice 1. If the area of a circle is 16, what is the radius?

2. If the circumference of a circle is 10, what is the area? Lets Practice

Find the area of the shaded region. Irregular Figures How would you find the area of this figure?

Area of Irregular Figures 2 different ways 1st Method:

1. Break the irregular shape up into known figures. 2. Find the area of each known figure.

3. Add all areas together to find the area of the irregular figure.

Area of Irregular Figures 2 different ways 1st Method:

Area of Irregular Figures 2nd Method: 1. Fill in the missing space. 2. Find the area of the large, filled in figure. Then, find the area of smaller shape.

3. Subtract. Area of large Area of small = Area of composite figure Area of Irregular Figures

2nd Method: Lets Practice

Lets Practice Regular Polygons P= perimeter

a= apothem: perpendicular bisector; from center to side

Lets Practice Each side of the regular heptagon has length 14.7 cm, and the apothem is about 10.1 cm. Area _________ cm2. (Round to the nearest

0.1.) Lets Practice A regular octagon has area 690 square feet and side length 20 feet. Find the apothem

to the nearest tenth of a foot. Any Way You Slice It Sector of a Circle: the region between two radii

and an arc of a circle. Sector of a Circle

() 2 360

Lets Practice

Segment of a Circle Segment of a Circle: the region between the chord and the arc of a circle.

- bh Lets Practice Find the area of the shaded region.