The Right Way to Solve for Unknown Sides—Are You Doing It? | Math Defined with Mrs C | 7.EE.B.4

The video tutorial teaches how to find unknown side lengths of geometric figures using one-step equations. It covers solving for the missing side of a triangle using its perimeter, identifying the triangle as scalene, and finding the missing side lengths of a quadrilateral and a parallelogram. The tutorial emphasizes the use of perimeter and congruency in solving these problems.

What is the perimeter of a triangle if two of its sides are 3 cm and 5 cm, and the third side is unknown but the total perimeter is 12 cm?

• 10 cm

• 15 cm

• 12 cm

• 8 cm

What is the specific name for a triangle with all sides of different lengths?

• Isosceles

• Equilateral

• Scalene

• Right

Why is the given quadrilateral not a trapezoid?

• It has equal sides.

• It has no right angles.

• It has more than four sides.

• It has no parallel sides.

If a quadrilateral has sides of 5.2 ft, 11.1 ft, and 6.4 ft, and a total perimeter of 34.6 ft, what is the length of the missing side?

• 13.1 ft

• 10.9 ft

• 12.5 ft

• 11.9 ft

In a parallelogram, if one side is 8.3 inches and the opposite side is unknown, what is the length of the opposite side if the perimeter is 24.2 inches?

• 6.3 inches

• 3.8 inches

• 4.2 inches

• 5.8 inches