Question

Diketahui limas alasnya persegi . luas alas limas 144 cm² tinggi limas 8 cm. berapa luas permukaan luarnya

Answer 1

Lalas = L.persegi = 144 cm²
L. alas = s²
s² = 144 cm²
s = √144
s = 12 cm
t = 8 cm
Lp = ....?
Lp = L.alas + L. selubung limas
Lp = s² + 4(  )
Lp = 144 cm² + 2 ( a × t )
Lp = 144 cm² + 2 ( 12 cm × 8 cm )
Lp = 144 cm² + 192 cm²
Lp = 336 cm²

Answer 2

Luas persegi = 144 cm²
              s²   = 144 cm²
                 s = √144 
                 s = 12 cm

Lp = La + 1/2Ka x t
    = 144 + 1/2 x 4s x 8
    = 144 + 1/2 x 4(12) x 8
    = 144 + 48 x 4
    = 144 + 192
    = 336 cm²