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 area of a rectangle with a length of 6 units and a width of 7 units?

• 21 square units

• 13 square units

• 49 square units

• 42 square units

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

• Add the base and height

• Subtract the base from the height

• Divide the area of the rectangle by two

• Multiply the base by the height

If a rectangle has an area of 28 square units, what is the area of a right triangle formed from it?

• 56 square units

• 28 square units

• 14 square units

• 7 square units

What is the area of a rectangle with a length of 7 units and a width of 5 units?

• 30 square units

• 12 square units

• 25 square units

• 35 square units

What is the area of a right triangle if the rectangle formed has an area of 35 square units?

• 17.5 square units

• 10 square units

• 35 square units

• 70 square units