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S = 15 cm
M = 2×
jawab
s' = M×s
s' = 2×15 cm
s' = 30 cm
f = s×s'÷(s+s')
f = 15×30÷(15+30)
f = 450÷45
f = 10 cm
r = 2f
r = 2×10cm
r = 20 cm
Jadi, jari" kelengkungan cermin tersebut adalah 20 cm