1.

Triangle abc angle b=90° angle a=30° angle c=60° ac=13cm find bc​

Answer»

Step-by-step EXPLANATION:

cos60 =  \frac{bc}{ac}  \\  \frac{1}{2}  =  \frac{bc}{13}  \\  \\ bc =  \frac{13}{2}  \: cm



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