Area of Regular Polygons
Presentation
•
Mathematics
•
6th Grade
•
Hard
James Gonzalez
FREE Resource
7 Slides • 10 Questions
1
Area of a Regular Polygon
Objective: Students will be able to identify regular polygons and find the area using congruent triangles.
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What is a polygon?
Straight sided, flat shapes that are closed
Comes from the Greek word meaning “many angles”
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What is a Regular Polygon?
all sides are the same lengths (congruent)and all angles have the same measurements.
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Multiple Choice
5
Multiple Select
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How can you find the area of a regular polygon?
Divide the polygon into congruent triangles
The number of triangles will be the same as the number of sides.
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Step 1: Make congruent triangles
Draw a from each vertex into the center
The vertex is where 2 line segments meet.
Make a dot in the center of the figure and connect it to each vertex.
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Multiple Choice
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Multiple Choice
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Step 2:Find the area of one triangle.
Remember A=1/2BH
Don't forget to multiply by half or divide by 2.
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Multiple Choice
What is the area of the triangle that has a 4in base and 10 in height?
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Multiple Choice
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Step 3: Find the area of the regular polygon
Take the area you found from 1 congruent triangle and multiply it by the number of sides.
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Multiple Choice
What is the area of the triangle in this polygon?
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Multiple Choice
How many sides does this figure have?
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Multiple Choice
If the area of the triangle in this figure is 28cm2, what is the area of the whole figure?
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Multiple Choice
Find the area of the regular polygon.
Area of a Regular Polygon
Objective: Students will be able to identify regular polygons and find the area using congruent triangles.
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