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3850=22/7×r²
3850x7=22r²
r²=26950/22
r²=1225
r=√1225
r=35cm
K=2×π×r
=2×22/7×35
=220cm
3850= 22/7. r²
26950= 22.r²
r²= 26950/22
r²=1225
r=√1225
r=35 cm
mka kliling.y adlah
kel= 2π.r
= 2. 22/7 . 35
= 44.5
= 220 cm