Heron's Formula
For a triangle with sides of length $a, b, c$:
$$\text{Area} = \sqrt{s(s - a)(s - b)(s - c)}$$
Where $s$ is the semi-perimeter:
$$s = \frac{a + b + c}{2}$$
High-yield revision notes, key concepts, formulas, and CBSE board examination questions for Class 9 Mathematics.
For a triangle with sides of length $a, b, c$:
$$\text{Area} = \sqrt{s(s - a)(s - b)(s - c)}$$
Where $s$ is the semi-perimeter:
$$s = \frac{a + b + c}{2}$$
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