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240 = 20 x t ÷ 2
t = 240 ÷ 20 ÷ 2
t = 24 cm
sisi segitiga :
sisi² = 24² + 10²
sisi² = 576 +100
sisi² = 676
sisi = √676
sisi = 26 cm
keliling segitiga sama kaki
= alas + sisi + sisi
= 20 + 26 + 26
=72 cm