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Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 6 - No. 41)

What are the essential components needed to calculate the area of any triangle if you use the formula: Area = 1/2 * a * b * sin(C)?
The lengths of any two sides of the triangle.
The measure of the included angle between those two sides.
The lengths of all three sides of the triangle.
The measure of all three angles of the triangle.

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You require two sides and the included angle.

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