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1260 = 60 x CE
CE = 1260 : 60 = 21 cm
Segitiga ABCE siku- siku di E
BC^2 = BE^2 + CE^2
= 20^2 + 21^2
= 841
BC = 29 cm
Keliling ABCD = 2( AB + BC )
= 2( 60 + 29 )
= 178 cm
Ket ^ pangkat
1260 = 60 x CE
CE = 1260 : 60 = 21 cm
Segitiga ABCE siku-siku di E
BC^2 = BE^2 + CE^2
= 20^2 + 21^2
= 841
BC = 29 cm
Keliling ABCD = 2 x ( AB + BC )
= 2 x ( 60 + 29 )
= 178 cm