Question

How can the area of this triangle be determined by forming a rectangle?

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Copy and rotate the triangle and place it next to the existing triangle to form a rectangle. The length of the rectangle is
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units. The width of the rectangle is
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units. The area of the rectangle is
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square units.

The area of the triangle is half the area of the rectangle, so the area of the triangle is
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square units.

Answer 1

The length of the rectangle is 9 units

The width of the rectangle is 2 units

The area of the rectangle is 18 square units

The area of the triangle is half the area of the rectangle, so the area of the triangle is 9 square units

Explanation: