Question

Gmn nih caranya . tolong ya bantuin

Answer 1

AC

sinB / AC = sinC / AB
sin30 / AC = sin90 / 20
(1/2) / AC = 1 / 20
AC = 20 * 1/2
AC = 10 cm

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BC :

SinA / BC = sinC / AB
sin 180 - (90+30) / BC = 1 / 20
sin60 / BC = 1 / 20
(1/2√3) / BC = 1 / 20
BC = 10√3 cm

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AD :

sin D / AB = sin B / AD
sin (180 - 45) / 20 = sin30 / AD
sin 135 / 20 = (1/2) / AD
(1/2√2) / 20 = (1/2) / AD
1/2√2 AD = 10
AD = 10 / (1/2√2)
AD = 20 / √2
AD = 20 / √2 * √2 / √2
AD = 10√2 cm