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(3x)²+(4x)²=100²
9x²+16x²=10000
25x²=10000
x²=400
x=20
maka panjangnya = 60, lebarnya = 80
kelilingnya = 2.140 = 280
luas = 60.80 = 4800
diagonal= 3x² + 4x²
100= 9x² + 16x²
100= 25x²
100/25= x²
4= x²
x²= 4
x= √4
x= 2
maka :
p= 3(2)
p= 6 m
l= 4(2)
l= 8 m
Keliling persegi panjang :
2(p + l)
2(6 + 8)
2(14)
28 m