1. Area & Perimeter Scrapbook
Robert Johnson
Ms.Togans
3rd Period

2. Rectangles Area = Length x Width Perimeter = 2Length + 2 Width
Ex. A rectangle has a length of 8 centimeters and a width of 3 centimeters.
P = 8 cm + 8cm + 3 cm + 3 cm = 22 cm
8 x 3 = 24

3. Triangle Area ½(bh) Perimeter a + b + c
Example 1: Find the area of an acute triangle with a base of 15 inches and a height of 4 inches.
Solution: = · (15 in) · (4 in) = · (60 in2) = 30 in2

4. Parallelogram Area : Base x Height
Perimeter : 2(Base Length + Side Length)
Suppose the length is 8 and the width is is 14 then multiply by 2 and your perimeter is 28.
Find the area of a parallelogram with a base of 12 centimeters and a height of 5 centimeters.
Solution: = (12 cm) · (5 cm) = 60 cm2

5. Circles Perimeter : 2pi r Area : A = II r²
Example 1:The radius of a circle is 2 inches. What is the diameter ?
Solution: d = 2 · (2 in) = 4 in
Example 1:The radius of a circle is 3 inches. What is the area ?
Solution: A = 3.14 · (3 in) · (3 in) A = 3.14 · (9 in2) A = in

6. Hexagon Perimeter : s + s + s + s + s + s Area : (3√3/2 )r²
Example 1: Find the perimeter of a triangle with sides measuring 5 centimeters, 9 centimeters and 11 centimeters.
Solution: P = 5 cm + 9 cm + 11 cm = 25 cm
Example 2 : Area = ½ x 6(3.00) x 2.60
Solution : Area = cm²