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250 = 1/2×20×d2
d2 = 250×2 ÷ 20
d2 = 500÷20
d2 = 25
AC = 250 × 2 : 20
AC = 500 : 20
AC = 25
maka.. sisi AC adalah... 25 cm... maaf itu mungkin centimeter bukan meter