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= (pxl) + ( keliling x Tbalok) + ( 4 x luas Δ)
lluas alas = P x L
= 26 x 9
= 234
luas selubung balok = keliling x Tbalok
= ( 26 + 9 + 26 + 9) x 10
= 70 x 10
= 700
luas permukaan limas
cari tinggi rusuk tegaknya dulu
arah panjang =
= √234
= 15,3
arah lebar =
= √394
= 19,8
luas selubung limas = 2 x Δdpn + 2xΔsamping
= ( 2x1/2x26x15,3) + ( 2x1/2x9x19,8)
= 397,8 + 178,2
= 576
jadi luas permukaan = 234 + 700 + 578
= 1510