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2 ⇒ π x 2² = π x 4
5 ⇒ π x 5² = π x 25
perbandingan = 4 : 25
10. L = 3850cm²
luas lingkaran = π x r²
3850 = x r²
r² =} [/tex]
r² = 1225
r = 35
kll lingkaran = π x d
= x 70
= 220cm
maap no 9 klo salah,, wk