Diketahui segitiga ABC dengan AC=10cm, sudut B=45° dan sudut A=30°, panjang BC adalah... A.10√2 cm B.5√6 cm C.5√2 cm D.5/2.√6 cm E.5/2.√2 cm Dijawab dgn caranya ya teman2
DB45
AC = b = 10 cm <B = 45 <A = 30 BC = a a/ sin A = b/ sin B a = (b. sin A)/(sin B) a = (10 sin 30) / sin 45 a = (10 )(1/2) / ( 1/2 √2) = 10/√2 = 1/2 (10 √2) a= 5√2
<B = 45
<A = 30
BC = a
a/ sin A = b/ sin B
a = (b. sin A)/(sin B)
a = (10 sin 30) / sin 45
a = (10 )(1/2) / ( 1/2 √2) = 10/√2 = 1/2 (10 √2)
a= 5√2