Question

Keliling lingksran yg luasnya 2.464 cm2 adalah

Answer 1

L = 2464
πr² = 2464
22/7 r² = 2464
r² = 2464 : 22/7
r²= 2464 X 7/22
r²= 17.248 / 22
r²= 784
r = √784
r = 28

K = 2πr
K = 2 X 22/7 X 28
K = 44 X 4
K = 176

Answer 2

L = πr²
2464 = 22 .r²
            7
2464.7 = 22r²
2464.7 = r²
   22
17248 = r²
   22
784 = r²
 r    = √784
 r    = 28 cm

Keliling = 2πr
           = 2.22.28
                 7
           = 2.22.4
           = 44.4
           = 176 cm