1. Perimeter and Area
By F. West

2. Objectives
Students will understand the meaning of perimeter & area
and apply it in problems. GLEC Standards and Benchmarks
M.UN. 03.05 II .3.2
3 grade math

3. Learning Resources and Materials
Ruler
Graph paper

4. Methods and Procedure
The teacher will introduce vocabulary, and demonstrate how to
solve perimeter and area problems.

5. Introduction
Step 1. Activate Prior Knowledge
What do you know about perimeter and area?

6. What is perimeter?
The distance measured around an object.

7. Look at the objects below
You can use a ruler to measure shapes.

8. Perimeter
Use the graph paper to draw some triangles and measure
them.

9. Perimeter
The formula to solve a triangle is P = a+b+c

10. Perimeter
A B
C

11. Find the Perimeter
10cm 10cm 8cm 8cm
10cm 8cm

12. What is the area?
The number of square units needed to cover a shape

13. What is the formula to solve the
area of a triangle?
A=½ hxb or A= hxb
2
6cm
4cm

14. Area

15. Find the Area
5cm 3cm
4cm 4cm
Area = Area =

16. Find the perimeter
P= 2L+2W
5
5 5
5

17. Find the Perimeter
5cm 11cm
5cm 11cm

18. Find the Area
A=LxW
12 cm
4cm

19. Assessment
Compute the area, go to
http://www.mathgoodies.com/lessons/vol1/area-triangle-
part3.html
Compute the perimeter and area of shapes, go to
http://www.mathgoodies.com/lessons/vol1/perim_part3.html

20. Resources
http://www.helpingwithmath.com/printables/worksheets/geo060
1area02.htm
http://www.mathgoodies.com/lessons/vol1/area-triangle-
part2.html
http://www.michigan.gov/documents/mde/3rd_Math_357689_7
.pdf
http://office.microsoft.com/en-us/images/?CTT=97