Find the perimeter of an equilateral triangle with an area of 9*sqrt(3) cm².
A12 cm
B18 cm
C24 cm
D36 cm
Explanation
Area of equilateral triangle = (sqrt(3)/4) * a^2 = 9*sqrt(3) => a^2 = 36 => a = 6 cm. Perimeter = 3 * a = 3 * 6 = 18 cm.
Exam Relevance
- Topic: Geometry & Mensuration
- Subtopic: Triangles
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