Finding the Area of a Right Triangle by Composing a Rectangle

This lesson teaches how to find the area of a right triangle by composing a rectangle. It begins with a review of calculating the area of a rectangle and explains that a right triangle is half of a rectangle. The lesson includes examples of creating congruent triangles to form rectangles and calculating their areas, followed by dividing the rectangle's area by two to find the triangle's area. The lesson concludes with a summary of the key concepts.

What is the formula to find the area of a rectangle?

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What mistake do students commonly make when calculating the area of a triangle?

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How do you find the area of a right triangle using a rectangle?

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If the length of a rectangle is 4 units and the width is 7 units, what is the area of the rectangle?

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How do you calculate the area of a triangle if you know the area of the rectangle it forms?

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