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76 = 2 * ( p + 13)
76= 2p + 26
2p = 76 - 26
2p = 50
p = 25
2. kelilingnya tidak di ketahui
4. K = 2* (p+l)
70 = 2 * ( p+ 10)
70 = 2p + 20
2p = 70-20
2p = 50
p = 25