tolong bantuannya fast respon

Anggap V = akar

a.CD

BD^2 =CD × AD
4^2 = CD × 2V5
16 = CD × 2V5
CD = 16/2V5
CD = 8V5/5 cm

d.AC

AC = 8V5/5 + 2V5
AC = 8V5/5 + 10/5V5
AC = 18V5/5 cm

b.BC

BC^2 = CD × AC
BC^2 = 8V5/5 × 18V5/5
BC^2 = 144 V25 / 25
BC^2 = 144 × 5 / 25 (Coret)
BC^2 = 144 / 5 cm

c.AB

AB^2 = AD^2 + DB^2 (PHYTAGORAS)
AB^2 = (2V5)^2 + 4^2
AB^2 = 4 V25 + 16
AB^2 = 4 × 5 + 16
AB^2 = 20 + 16
AB^2 = 36
AB = V36
AB = 6 cm

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