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Per NCERT Class 9 Math, HERON's FORMULA gives the area of a triangle in terms of which inputs?
AOnly the angles of the triangle
BOnly the base and height
COnly the perimeter
DThe three SIDE LENGTHS (a, b, c) — without needing to know the height
Answer & Solution
Correct answer: D. The three SIDE LENGTHS (a, b, c) — without needing to know the height
Heron's formula uses only the three sides — useful when height isn't known. The other options miss the formula's purpose.
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