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l=√26^2-10^2
l=√676-100
l=√576
l=24
kel= 2(p+l)
kel= 2(10+24)
kel= 2(34)
kel= 68
sisi datar/lebar = √26² - √10²
= √676 - √100 = √574 = 24
k.persegi panjang = 2 (p+l)
= 2 (10+24) = 20+48 = 68 cm