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A triangular garden has a perimeter of 24 feet, and two of its sides measure 4 feet and 9 feet. How long is the third side?
A11 feet
B13 feet
C9 feet
D15 feet
Answer & Solution
Correct answer: A. 11 feet
1. Let c equal the length of the third side.
2. The perimeter formula gives 24 equals 4 plus 9 plus c.
3. Combine the known sides: 24 equals 13 plus c.
4. Subtract 13 from both sides to get c equals 11 feet.
_Source: OpenStax Elementary Algebra (CC BY 4.0), Ch 3 "Math Models", section 3.4 Solve Geometry Applications: Triangles, Rectangles, and the Pythagorean Theorem_
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