Mrs. Brenda Rodriguez 5th and 6th Grade Math

Menu • Objectives

• Instructions

• Theme: “Perimeter and Area”

• Activities

• Glossary

Objective

• Finding the perimeter and area of a rectangle and square using formulas.

Instructions

• Find the perimeter of rectangles and squares with the given dimensions.

• Find the area of rectangles and squares with the given dimensions.

• Perimeter is the distance around a figure. For a figure with straight sides, the perimeter is the sum of the lengths of the sides. Perimeter is measured in linear units such as ft., cm, m, Km, in.

• Area is the number of square units needed to cover a figure. Area is measured in square units such as square centimeters (cm2) or square inches (in2).

Perimeter Formulas • The perimeter of some polygons can be given

as a formula.

• The sides of a square are the same lengths. The perimeter equals 4 time the lengths of a side(s).

• Perimeter of a square: s + s + s + s = 4 x s =

P= 4s s

s s

s

• The opposite sides of a rectangle are the same length. The perimeter equals 2 times the length (l) plus 2 times the width (w).

• Perimeter of a rectangle:

P = 2(l + w)

l

w = w

width

I = length

Perimeter Activity • The Parks Committee wants to choose the land

with the largest perimeter. Find the one they should choose.

w = 110 ft.

l = 240 ft. s = 165 ft.

Park A Park B

• The area of a shape is the amount of space it covers.

• One way to measure the area of a shape is to count the number of squares units it covers.

Area Formulas

• To find the area of a square or rectangle using formulas is to multiply the length by the width.

• Area of a square = side x side = s x s = s2

• Area of a rectangle = length x width = l x w = lw

Area Activity • Find the area of the shapes:

10 cm

3 cm

A. 13 cm2 10 ft.

B. 26 cm 2

C. 30 cm2

A. 10 ft2

B. 100 ft2

C. 20 ft2

• Polygon – A geometric figure made up of three or more line segments that intersect only at their endpoints.

Answer

Answer

Answer

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