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(30 x N) / 2 = 600
30 x N = 600 x 2
30 x N = 1200
N = 1200 / 30 = 40
Cari Sisi Belah Ketupatnya ( X = Sisinya)
15² + 20 ² = X²
225 + 400 = 625
√625 = 25 <= Panjang Sisinya
Maka Kelilingnya adalah 25 x 4 = 100 cm
2(30d2)=600
30.d2 = 1200
d2 = 1200/30
d2= 40
30/2 = 15
40/2= 20
akar dari (15.15) + (20.20) = akar dari 625
= 25
keliling = 25 . 4 = 100 :)