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s = 20 cm
r = 14,4 cm
Ditanya:
s' = ...?
M = ...?
Jawab:
f = 1/2 r = 1/2 . 14,4 cm = 7,2 cm
s' = (s . f) / (s + f)
= (20 cm . 7,2 cm) / (20 cm + 7,2 cm)
= 5,3 cm
M = s' / s
= 5,3 cm / 20 cm
= 0,625 kali
Sifat = nyata, diperkecil