Finding Unknown Side Measures in Rectangles

This video tutorial covers lesson 13.4, focusing on finding unknown measures for area or perimeter. It revisits concepts from previous lessons on perimeter and area, emphasizing the use of formulas to find unknown side lengths in rectangles and squares. The tutorial explains how to use division as an inverse operation to solve for missing dimensions and provides examples of applying these concepts to solve problems. The lesson concludes with a preview of the next lesson, which will involve word problems and finding areas with shapes inside other shapes.

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

• Perimeter = length x width

• Area = length + width

• Area = base x height

• Perimeter = 2(length + width)

If a rectangle's perimeter is 28 cm and one side is 10 cm, what is the length of the other side?

• 4 cm

• 8 cm

• 10 cm

• 14 cm

How can you find an unknown side length if you know the area and one side length of a rectangle?

• Divide the area by the known length

• Add the area and the known length

• Subtract the known length from the area

• Multiply both known lengths

How do you find the missing height of a rectangle if you know the area and the base?

• Multiply the area by the base

• Subtract the base from the area

• Divide the area by the base

• Add the area to the base

What operation is considered the inverse of multiplication when solving for unknown measures?

• Addition

• Subtraction

• Division

• Multiplication

What is the perimeter formula for a square?

• Perimeter = 4 x side length

• Perimeter = 2 x (length + width)

• Perimeter = side length + side length

• Perimeter = side length x side length

If a square has a perimeter of 36 cm, what is the length of one side?

• 36 cm

• 9 cm

• 12 cm

• 18 cm

For a square with an area of 25 square inches, what is the perimeter?

• 20 inches

• 25 inches

• 50 inches

• 100 inches

What is the area of a square baby quilt with a perimeter of 12 feet?

• 9 square feet

• 3 square feet

• 12 square feet

• 36 square feet

If the area of a rectangle is 72 square yards and one side is 6 yards, what is the height?

• 36 yards

• 18 yards

• 6 yards

• 12 yards