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yang b memakai 3,14
kalau tidak salah
346.5 = 3.14 . r²
r² = 346.2/3.14
= 110.25
r = √110.5
= 10.5
maka d = 2xr
= 2x10.5 = 21
b. Luas lingkaran = πr²
78.5 = 3.14 . r²
r² = 78.5/3.14
= 25
r = √25
=5
maka d = 2xr
= 2x5 = 10