L = π r²
3850 = 22/7 r²
r² = 3850 x (7/22)
r = √1225
= 35
diameter = 2 kali jari -jari, maka d = 2 x 35 = 70 cm
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=√28 .3850 /22
=√107800/22
=√4900
=70
diameternya 70cm
L = π r²
3850 = 22/7 r²
r² = 3850 x (7/22)
r = √1225
= 35
diameter = 2 kali jari -jari, maka d = 2 x 35 = 70 cm