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240 = 1/2 x AB x t
240 = 1/2 x 48 x t
240 = 24 x t
t = 240 / 24
t = 24 cm
AC² = t² + (1/2 .AB)²
= 10² + 24²
= 100 + 576
= 676
AC = √676
AC = 26 cm
keliling = AB + BC + AC
= 48 + 26 + 26
= 100 cm