Finding Missing Sides (Grade 7)
Practice worksheet for 7th graders on finding missing sides of geometric shapes using various methods.
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Finding Missing Sides: Grade 7
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Read each question carefully and solve for the missing side. Show your work where indicated.
1. Find the length of the missing side (x) in the right-angled triangle below. Use the Pythagorean theorem (a² + b² = c²).
Show your work:
x =
2. A rectangle has a perimeter of 40 cm. If its length is 12 cm, its width is cm.
3. A square has an area of 81 square meters. The length of one side is meters.
4. A circle has a circumference of 31.4 cm. What is its approximate diameter? (Use π ≈ 3.14)
Show your work:
Diameter =
5. An equilateral triangle has a perimeter of 27 inches. What is the length of one side?
6 inches
9 inches
12 inches
13.5 inches