Question

Bantuin ea, yg dibulatkan saja dengan pembahasannya
thanks

Answer 1

Verified answer

No 1
3/PQ = 9/15
3 x 15 = 9 PQ
45 = 9 PQ
PQ = 45/9 = 5 cm (b)

No 2
Pake trik rumus buat nyari EF lebih cepet, lihat penurunan rumusnya di idschool.net/smp/rumus-kesebangunan-trapesium

EF= (DC x AE + AB x DE)/(AE + DE)
EF = (6 x 5 + 18 x 3)/(5 + 3)
EF = (30 + 54)/8
EF = 84/8 = 10,5 (c)

No 6
KC/MC = AB/(1/2MC)
20/20 = AB/10
1 = AB/10 ====> AB = 10 (d)