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For a square, write the formulas for area and side length. Which square root is used?
Question: For a square, write the formulas for area and side length. Which square root is used?
Sample answer: The area formula is . The side length formula is . Use the principal (positive) square root because side length is positive.
Key points:
- Area:
- Side length:
- Use the principal (positive) square root.
- A side length is positive.
Rubric: Full credit: Gives both correct formulas and identifies the principal (positive) square root with a correct reason.
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OpenStax
Elementary Algebra @ OpenStax
Ch.9 Roots and Radicals - Elementary Algebra @ OpenStax
Algebra
Math
Prealgebra
Recall in Bloom's Taxonomy
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