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The figure below shows an isosceles triangle in which AB = AC = 6cm. Angle BAC = 80˚. Calculate the length of BC.

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The figure below shows an isosceles triangle in which AB = AC = 6cm. Angle BAC = 80˚.
Calculate the length of BC.  
F1ET1mathQ14

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F1ET1mathAns14
sin 40 = a/6
a = 6 sin 40
a = 3.85672
BC = a+a
=3.85672 + 3.85672
BC = 7.713cm

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