Tolong jawabannya nomor1,2,3

1. b, cara: 75-33 = 42:2 = 21
2. b, cara : L= a x t : 2
A = L x 2 : 7
= 84 X 2 = 168 : 7 = 24
3. d, cara : K = s + s + s. (sisi)
= 5 + 12 + 13 = 30
L = a x t : 2
= 12 X 5 : 2
= 60 : 2 = 30


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