Question

Hitunglah panjang jari-jari jika luas lingkaran :
a.314cm² (=3,14)
b.1.386cm² (=22)
7
c.2.826cm² (=3,14)
d.2.464cm² (=22)
7

Answer 1

A. L = vhi x r^2
    314 = 3,14 x r^2
    r^2 = 314 : 3,14 = 100
    r = akar 100 = 10 cm
b.1386 = 22 x r^2
                7
   r^2 = 1386 : 22 = 441
                        7
  r = akar 441 = 21 cm
c.2826 = 3,14 x r^2
   r^2 = 2826 : 3,14 = 900
   r = akar 900 = 30 cm
d.2464 = 22 x r^2
               7
   r^2 = 2464 : 22 = 784
                        7
   r = akar 784 = 28 cm

Answer 2

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