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Sudut a = 30°
sudut b = 90°
sudut c = 60°
g = 20 cm
f;e= ?

pake rumus sin

g/sin b = e/ sin a
20/sin90 = e/sin30
20/1 = e/(1/2)
20 = 2e
e = 10

e/sin a = f/sin c
10/sin30 = f/sin60
10/(1/2) = f/(√3/2)
20 = 2f/√3
20√3 = 2f
f= 10√3

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