Tolong dijawab yg nomer 4 ya
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= 70 * 20
= 1400
L2= 1/2 Phi r kuadrat
= 1/2 * 22/7 * 35 * 35
= 1/2 * 22*5*35
= 11 *5*35
=55* 35
= 1925
L= L1 + L2 = 1400+1925 = 3325