Find a missing side length when given perimeter (practice) | Khan ... - Free Printable

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- Draw a perpendicular line from the top-left corner of the trapezoid down to the bottom base. This creates a right triangle on the left and a rectangle on the right.
- The bottom base is 10 m and the top base is 6 m, so the horizontal leg of the right triangle is 10 - 6 = 4 m.
- The hypotenuse of the right triangle is the slanted side, which is 8 m.
- Use the Pythagorean theorem: a² + b² = c², where a is the height (unknown), b is 4 m, and c is 8 m.
- So, a² + 4² = 8² → a² + 16 = 64 → a² = 48 → a = √48 = 4√3.
- Therefore, the height is 4√3 meters.

Parent Tip: Review the logic above to help your child master the concept of perimeter with missing side.

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