a)
b = sinB/sinA×6cm
= sin(120°)/sin(30°)×6cm
= sin(180°-60°)/(1/2)×6cm
= sin60°×12cm
= √3/2×12cm
= 6√3cm
b)
C = 180°-120°-30°
= 30°
c = sinA/sinC×6cm
= sin30°/sin30°×6cm
= 6cm
c)
C = 30°
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a)
b = sinB/sinA×6cm
= sin(120°)/sin(30°)×6cm
= sin(180°-60°)/(1/2)×6cm
= sin60°×12cm
= √3/2×12cm
= 6√3cm
b)
C = 180°-120°-30°
= 30°
c = sinA/sinC×6cm
= sin30°/sin30°×6cm
= 6cm
c)
C = 30°