Answer to Question #316171 in Geometry for Jrs

Question #316171

It is planned to build a bridge AB across the river.

Calculate the length of the bridge if the base BC

= 165 m, ß = 108 °, y = 20 °


1
Expert's answer
2022-03-24T18:51:22-0400



To calculate the length of the bridge we use sine rule

csineC=asineA\frac{c}{sineC}=\frac{a}{sineA}


Therefore,

csine20°=165°sine52°\frac{c}{sine20°}=\frac{165°}{sine52°}


Cross multiply to get the unknown value


c=165sine20°sine52°c=\frac{165sine20°}{sine52°}


c=152.68mc=152.68m


Therefore, the length of the bridge will be

152.68m152.68m

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