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Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 1 - No. 38)

To find the area of a triangle, using the formula 1/2 * a * b * sin C, what information is needed?
The lengths of sides a and b.
The measurement of angle C.
The length of side c.
The length of side a.

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We need lengths of two sides and included angle.

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