Calculating Perimeter with Missing Sides

This video tutorial covers the concept of perimeter, demonstrating how to calculate it for various shapes, including triangles and trapezoids. It also includes solving for unknown side lengths when the perimeter is given, using both direct calculation and word problems. The tutorial emphasizes setting up equations and using properties like the commutative property to solve these problems.

What is the perimeter of a triangle with sides of 4 cm, 3 cm, and 4 cm?

• 9 cm

• 10 cm

• 12 cm

• 11 cm

If a shape's perimeter is 14 inches and two of its sides are 5 inches each, how long is the unknown side?

• 8 inches

• 6 inches

• 4 inches

• 2 inches

What property allows us to rearrange the numbers when adding to find the perimeter?

• Associative Property

• Commutative Property

• Distributive Property

• Identity Property

How long is the missing side of a trapezoid if its perimeter is 17 feet and the other three sides are 3, 4, and 4 feet?

• 5 feet

• 6 feet

• 7 feet

• 8 feet

If a shape's perimeter is 20 meters and the known sides are 3, 5, 4, and 6 meters, what is the length of the missing side?

• 2 meters

• 1 meter

• 3 meters

• 4 meters

Jose has 40 feet of fencing for his garden. If three sides are 10, 5, and 15 feet, how long is the last side?

• 20 feet

• 15 feet

• 5 feet

• 10 feet

Rachel needs to frame her picture with 16 inches of wood. If three sides are 3, 5, and 3 inches, how much wood does she need for the fourth side?

• 4 inches

• 6 inches

• 3 inches

• 5 inches

What is the first step in finding the missing length when you know the perimeter of a shape?

• Divide the perimeter by the number of sides

• Multiply the known sides

• Add up the known values

• Subtract the known lengths from the perimeter

Which method did not get used to solve for the missing length in the examples?

• Subtraction

• Addition

• Using a number line

• Multiplication

What is the perimeter of a rectangle with sides of 5 meters and 10 meters?

• 25 meters

• 30 meters

• 20 meters

• 15 meters