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Luas permukaan = 5.014 cm²
k = 90 cm
4x sisi = 90 cm
sisi = 45/2 cm
panjang alas = lebar alas = 45/2 cm ⇒ ( persegi = semua sisi sama )
L.prisma = 2( p x l + p x t + l x t )
5.014 cm² = 2( 45/2 . 45/2 + 45/2(t) + 45/2(t) )
5.014 cm² = 2( 2.025/4 + 90t )
5.014 cm² / 2 = 2.025/4 + 90t
2.507 cm² = 2.025/4 + 90t ⇒ ( dikali 4 )
10.028 cm² = 2.025 + 360t
360t =10.028 cm² - 2.025
360t = 8.003
t = 8.003 / 360
t = 22,23 cm
trimakasih