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panjang = 4 x 12 = 48
lebar = 3 x 12 = 36
diag0nal =
=
=
= 60
K= 84
K= 2(p + l)
84= 2(4 + 3)
84= 2(7)
84= 14
84/14= 6
Maka :
p= 4(6)
= 24 cm
l= 3(6)
= 18 cm
Misalnya :
a= 24 cm
b= 18 cm
c= ?
Jawab :
c²= a² + b²
= 24² + 18²
= 576 + 324
= 900
c = √900
= 30
Jadi, panjang diagonalnya adalah 30 cm.