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diagonal pada bidang alas =
=
=
= √225
= 15 cm
diagonal = 2 x 15 = 30 cm
diagonal = s√2
30 = s√2 ------- kedua ruas pangkatkan 2
900 = s² . 2
s² = 900 : 2
s² = 450
s = √450
s = 15√2
t.Δ selimut =
=
=
=
=
= √4734
keliling persegi = 4 x s
= 4 x 15√2
= 60√2 cm
L.permukaan liman = L.alas + L.selimut
= s² + 4 x L.Δ
= 450 + 4 x x 15√2 x √4743
= 450 + (15√2 )(√4743)
= 450 + 15√9468
= 450 + 15.(97,3)
= 450 + 1459,5
= 1909,5 cm²