Area of a Triangle and Polygon

Area of Triangles

It might be helpful to take notes in your math notebook!​

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What is the area of the rectangle? Type in your answer as one number only!

​To get the area of one triangle, you simply need to get half of the area of a rectangle!

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The area of a rectangle is found by multiplying ​the base and height.

All rectangles are composed ​of two triangles as shown in the picture.

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​The area of this rectangle is 4 x 8, which is 32 square units

​This means that one triangle is half of the rectangle, and half of 32 is 16 square units.

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Multiple Choice

What is the area of this triangle? Go back to the previous slide if you don't know what to do!

• 12 square units

• 20 square units

• 15 square units

• 10 square units

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Type in the area of this triangle as one number only!

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Type in the area of the triangle as one number only

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Type in the area of the triangle as one number only

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A rectangle has an area of 40 square units. If the base is 8 units, what is the height? Type in your answer as one number only!

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A triangle has an area of 10 square inches. If the base is 2 inches, what is the height? Type in your answer as one number only!

Polygons are all shapes with 3 or more sides.

To get the area of a polygon, separate the shape into smaller parts to get the total area!​

The blue shape is an example of a polygon​

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Area of Polygons

​The blue polygon can be separated into a rectangle and a triangle, as shown by the orange line above. You can then get the area of each and add them together!

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Type in the total area of this polygon as one number only!

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Type in the total area of the polygon as one number only!

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Type in the total area of the polygon as one number!

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Type in the area of the polygon as one number only!

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Type in the total area of the polygon as one number!

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Type in the total area of the polygon as one number only.

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Type in the total area of the polygon as one number only

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Type in the area of the polygon as one number without units