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Casio fx-3650P Cosine Formula B Given the two sides a, b and their included angle C of a triangle, then the third side c can be found by c a c a 2 b 2 2ab cos C . A C b Programming Guide Programming steps Remarks Switch to Program Edit Mode. 1 1 ? Select P1 for programming. A : ? A B B 2 : ? C : 2 A B Store input data a, b, c in memories A, B, C. C Apply Cosine Formula. Exit Program Edit Mode and return to Run Mode. Running the program The table below summarizes how you may use the program to solve the following problem. ● In △ABC, if a = 2, b = 2, C = 60°, find c. Keying steps Display Remarks A? 1 * Select P1. * stands for the value stored in memory. B? 2 * C? 2 Follow the input prompts of the calculator. * (A2+B2-2ABc 60 2 0 Answer. You can continue your input for the next problem by pressing . Exit. The same program can be used to find a and b. Always enter the adjacent sides as inputs A and B and the included angle as input C. Further Practice Now you can try to solve the following questions using the program. Check whether you can get the correct results. Adjacent Sides Included Angle Input (A; B; C) Opposite side Output 3, 4 50 3; 4; 50 3.094 (3 d.p.) 3.094042238 1, 2 1, 3 45 1; 2 ; 45 1; 3 ; 90 1 1 2 2 90