Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 7 - No. 39)
Which of the following are necessary to calculate the area of a non-right triangle using the formula Area = 1/2 * ab * sin C?
The lengths of sides a and b
The measure of angle C
The length of side c
All three angles of the triangle.
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You need the lengths of two sides and the angle included between them.