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Ka = 72cm
4.s = 72cm
s =
s = 18cm
b.
t limas =
=
= √144
=12 cm
c.
La = s²
= 18²
= 324cm²
V =
=
= 1620 cm³
d.
Lp = s(s+2t)
= 18(18+2.15)
= 18(48)
= 864 cm²
keliling persegi = 4 S ---> rumusnya
72 = 4 s
s = 18
b. volume limas = 1620
Volume =1/3 x luas ala x TL
= 1/3 x 18 x 18 x 15
= 1620
c. luas limas seluruhnya = 954
yg belum ada rusuk tegak
rusuk tegak = = √306 = 17,5
luas permukaan = luas alas + (4 x luas Δ)
= ( s x s ) + ( 4 x 1/2 x alas x rusuk tegak)
= ( 18 x 18 ) + ( 4 x 1/2 x 18 x 17,5)
= 324 + 630
= 954