0-7: PERIMETER

0-7: Perimeter  Perimeter: The distance around a figure. Perimeter is measured in linear units.

0-7: Perimeter 

EExample 1: Find the perimeter of each figure A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

EExample 1: Find the perimeter of each figure BB) A square with side length of 7 centimeters P = 4s = 4(7) = 28 The perimeter is 28 centimeters

EExample 1: Find the perimeter of each figure CC) The parallelogram below P = 2(a + b) = 2( ) = 2(26) = 52 The perimeter is 52 meters

EExample 1: Find the perimeter of each figure DD) The triangle below P = a + b + c = = 19 The perimeter is 19 inches

 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 = 2 π r or C = π d

0-7: Perimeter EExample 2: Find each circumference to the nearest tenth AA) The radius is 4 feet C = 2 π r = 2 π (4) ≈ 25.1 The perimeter is about 25.1 feet BB) The diameter is 15 centimeters C = π d = π (15) ≈ 47.1 The perimeter is about 47.1 centimeters

 Assignment  Page P25 1 – 19 (odds)

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 

EExample 1: Find the area of each figure A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

EExample 1: Find the area of each figure BB) A square with a side length of 2 meters A = s 2 = (2) 2 = 4 The area is 4 square meters

EExample 1: Find the perimeter of each figure C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

EExample 1: Find the perimeter of each figure D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

TThe formula for the area of a circle is A = π r 2 EExample 2: Find each area to the nearest tenth AA) The radius is 3 cm A = π r 2 = π (3) 2 ≈ 28.3 The area is about 28.3 square centimeters

TThe formula for the area of a circle is A = π r 2 EExample 2: Find each area to the nearest tenth AA) The diameter is 21 m A = π r 2 = π (10.5) 2 ≈ The area is about square meters

 Assignment  Page P28 1 – 17 & (odds)