Pythagorean Theorem: Find a Leg
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Pythagorean Theorem: Find a Leg
Pythagorean theorem: find the missing leg of six right triangles, some turned or resting on the hypotenuse, from the hypotenuse and the other leg. Grade 8, with an answer key.
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- Pages
- 1
- Last updated
- Time
- About 15 minutes
- Answer key
- Included
- Printing
- Black and white
- Related curriculum
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Use a² + b² = c² to find a missing side of a right triangle, tell whether three lengths make a right triangle, and find the distance between two points on a grid.
Reviewed by Mr. Robert Harrison, Teacher. How we check worksheets
How to use this sheet
- Have the child label the hypotenuse c first: it is across from the right angle and is the longest side.
- Write a² + b² = c² with the numbers in before working it out.
- Check each answer: the hypotenuse must be the longest side.
Common mistakes
- Adding the side lengths instead of their squares, so 3 and 4 give 7. Square them: 9 + 16 = 25, so 5.
- Adding the squares when finding a leg. To find a leg, subtract the squares.
- Forgetting to take the square root at the end, so the answer is 25 instead of 5.
