Perimeter and Area
description
Transcript of Perimeter and Area
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Perimeter and Area
By F. West
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ObjectivesStudents 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
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Learning Resources and Materials
Ruler
Graph paper
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Methods and ProcedureThe teacher will introduce vocabulary, and demonstrate how to solve perimeter and area problems.
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IntroductionStep 1. Activate Prior Knowledge
What do you know about perimeter and area?
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What is perimeter?The distance measured around an object.
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Look at the objects belowYou can use a ruler to measure shapes.
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Perimeter
Use the graph paper to draw some triangles and measure them.
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PerimeterThe formula to solve a triangle is P = a+b+c
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Perimeter
A B
C
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Find the Perimeter
10cm 10cm 8cm 8cm
10cm 8cm
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What is the area?The number of square units needed to cover a shape
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What is the formula to solve the area of a triangle?A=½ hxb or A= hxb
2
6cm
4cm
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Area
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Find the Area
5cm 3cm
4cm 4cm
Area = Area =
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Find the perimeterP= 2L+2W
5
5 5
5
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Find the Perimeter
5cm 11cm
5cm 11cm
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Find the AreaA=LxW
12 cm
4cm
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AssessmentCompute 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
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Resourceshttp://www.helpingwithmath.com/printables/worksheets/geo0601area02.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