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 °
To calculate the length of the bridge we use sine rule
"\\frac{c}{sineC}=\\frac{a}{sineA}"
Therefore,
"\\frac{c}{sine20\u00b0}=\\frac{165\u00b0}{sine52\u00b0}"
Cross multiply to get the unknown value
"c=\\frac{165sine20\u00b0}{sine52\u00b0}"
"c=152.68m"
Therefore, the length of the bridge will be
"152.68m"
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