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area of 2D shapes - Coggle Diagram

- - - - If we are given a triangle with two sides of 8cm and 10cm and the area is 20cm2, we can calculate the angle between the sides as follows:
        
        20 = 1⁄2 × 8 × 10 × sin(C)
        
        20 = 40 × sin(C)
        
        sin(C) = 1⁄2
        
        C = 30°