Finding Unknown Side Lengths
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Objective
I can find a missing side length of a shape when I know the other side lengths.
Part 1 of 3
Warm-up video
Unknown Channel · 5:00
We don't generate video — this one is by Unknown Channel on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.
Part 2 of 3
Practice
7 questions
What does "perimeter" mean? Explain it in your own words.
Imagine a rectangle. Two sides are 5 inches long, and two sides are 3 inches long. What is the perimeter of the rectangle?
Part 3 of 3
Exit ticket
Quick comprehension check
“A triangle has sides that measure 7 cm, 9 cm, and 5 cm. What is the perimeter of the triangle? A rectangle has sides that measure 12 inches, 6 inches, 12 inches, and 6 inches. What is the perimeter of the rectangle? A shape has sides that measure 8 feet, 8 feet, 8 feet, 8 feet, 8 feet, and 8 feet. What is the perimeter of the shape?”
Sample answer included in the free materials
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Teacher Guide
Complete lesson plan with answer keys and alternate activities
Student Handout
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