Pliss,mohon bantuannya,no 18 kak,mksh kak

CE = 8 - 2 = 6cm
a.
DE² = CE² + DC²
DE² = 8² + 6²
DE² = 64 + 36
DE² = 100
DE = 10cm
b.
CE² = OE × DE
6² = OE × 10
OE = 36/10
OE = 3,6cm
c.
OD = DE - OE = 10 - 3,6 = 6,4cm
d.
OC² = OE × OD
OC² = 3,6 × 6,4
OC² = 23,04
OC = 4,8 cm
e.
OF = CF - OC = 10 - 4,8 = 5,2cm