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Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 3 - No. 42)

If you are given the lengths of all three sides (a, b, and c) of a triangle, what can you directly calculate using the Cosine Rule?
The angles of the triangle.
The area of the triangle
The perimeter of the triangle
The length of the largest side.

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You can calculate the angles.

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