0-7: PERIMETER

0-7: Perimeter Perimeter: The distance around a figure.

Perimeter is measured in linear units.

0-7: Perimeter

0-7: Perimeter Example 1: Find the perimeter of each

figure A) A rectangle with a length of 5 inches and

a width of 1 inch P = 2(l + w) = 2(5 + 1) = 2(6) = 12 The perimeter is 12 inches

0-7: Perimeter Example 1: Find the perimeter of each

figure B) A square with side length of 7

centimeters P = 4s = 4(7) = 28 The perimeter is 28 centimeters

0-7: Perimeter Example 1: Find the perimeter of each

figure C) The parallelogram below

P = 2(a + b) = 2(12 + 14) = 2(26) = 52 The perimeter is 52 meters

0-7: Perimeter Example 1: Find the perimeter of each

figure D) The triangle below

P = a + b + c = 4 + 6 + 9 = 19 The perimeter is 19 inches

0-7: Perimeter Circle: The set of all points that are the same

distance from a given point (the center) Circumference: The distance around the circle Radius: The distance from the center to any point

on the circle Diameter: The distance across the circle through

the center The formula for the circumference is either

C = 2πr orC = πd

0-7: Perimeter Example 2: Find each circumference to the

nearest tenth A) The radius is 4 feet

C = 2πr = 2π(4) ≈ 25.1 The perimeter is about 25.1 feet

B) The diameter is 15 centimeters C = πd = π(15) ≈ 47.1 The perimeter is about 47.1 centimeters

0-7: Perimeter Assignment

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0-8: AREA

0-8: Area Area: the number of square units needed

to cover a surface. Area is measured in square units.

0-8: Area

0-8: Area Example 1: Find the area of each figure

A) A rectangle with a length of 7 yards and a width of 1 yard A = lw = (7)(1) = 7 The area is 7 square yards

0-8: Area Example 1: Find the area of each figure

B) A square with a side length of 2 meters A = s2

= (2)2

= 4 The area is 4 square meters

0-8: Area Example 1: Find the perimeter of each

figure C) A parallelogram with a base of 11 feet

and a height of 9 feet A = bh = (11)(9) = 99 The area is 99 square feet

0-8: Area Example 1: Find the perimeter of each

figure D) A triangle with a base of 12 millimeters

and a height of 5 millimeters A = ½bh = ½(12)(5) = 30 The area is 30 square millimeters

0-8: Area The formula for the area of a circle is

A = πr2

Example 2: Find each area to the nearest tenth A) The radius is 3 cm

A = πr2

= π(3)2

≈ 28.3 The area is about 28.3 square centimeters

0-8: Area The formula for the area of a circle is

A = πr2

Example 2: Find each area to the nearest tenth A) The diameter is 21 m

A = πr2

= π(10.5)2

≈ 346.4 The area is about 346.4 square meters

0-8: Area Assignment

Page P28 1 – 17 & 21-23 (odds)