Question

materials crayons or markers, centimeter ruler for each student.
find the perimeter of the figure at the right by answering exercises 1-3. perimeter is the distance around a figure. each space between lines equals 1 unit.
1 unit 2 units

1. trace the figure with a crayon or marker. count the number of spaces as you trace.
2. how many spaces did you trace? ______
3. what is the perimeter of the figure? ______ units

you can also find the perimeter by adding the lengths of the sides.
find the perimeter of the figure to the right by answering exercises 4-6.

1. how many sides does this figure have? ______
2. trace over the sides as you count and record the length of each side.

____ + __ + __ + __ + __ + __ + __ = ____

1. what is the perimeter of the figure? ______ meters

find the perimeter of the rectangle by answering exercises 7-8.
opposite sides of a rectangle have equal lengths.

1. record the length of the sides. find the sum.

$10 + 3 + \\_\\_\\_\\_\\_ + \\_\\_\\_\\_\\_ = \\_\\_\\_\\_\\_$

1. what is the perimeter of the rectangle? ______ cm

scale: |-| = 1 unit
scale: ·---· = 1 meter
10 cm

Explanation:

Step1: Count traced spaces (Q1-3)

Trace the first figure; count outer unit edges.
Count = 16

Step2: Answer Q2 and Q3

Perimeter = traced spaces.
Q2: 16; Q3: 16 units

Step3: Count sides (Q4)

Count edges of the second figure.
Side count = 12

Step4: List side lengths (Q5)

Lengths (in meters): $3, 2, 1, 3, 4, 1, 3, 2, 1, 3, 4, 1$
Sum: $3+2+1+3+4+1+3+2+1+3+4+1 = 28$

Step5: Answer Q6

Perimeter = sum of sides.
Q6: 28 meters

Step6: Fill rectangle sides (Q7)

Rectangle opposite sides equal: missing sides = 10, 3.
$10+3+10+3 = 26$

Step7: Answer Q8

Perimeter = sum of rectangle sides.
Q8: 26 cm

Answer:

1. (Instruction: Trace the figure and count spaces as you trace)
2. 16
3. 16 units
4. 12
5. $3 + 2 + 1 + 3 + 4 + 1 + 3 + 2 + 1 + 3 + 4 + 1 = 28$
6. 28 meters
7. $10 + 3 + 10 + 3 = 26$
8. 26 cm