Hitunglah luas bola dgn :
-jarijari 45 cm dan π = 22\7
-diameter 80cm dan π = 3,14
-jarijari 45 cm dan π = 22\7
-diameter 80cm dan π = 3,14
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= 4 x 22/7 x 45 kuadrat = 25.457,142857 cm persegi
b) Lp = 4 x phi x r kuadrat
= 4 x 3,14 x 40 = 502,4 cm persegi