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22/7 d = 176
d = 56 cm
r = 28 cm
L = 28 x 28 x phi
L = 784 phi cm
L = 2464 cm2
π = 22/7
Rumus keliling lingkaran = π.d
Ditanya: Luas lingkaran?
Jawab: d = (176 cm : 22) x 7
= 56 cm
r = 56cm:2
= 28 cm
Luas lingkaran = π.r²
= 22/7.56cm.56cm
= 2646 cm²
Smoga mmbntu.., :-)