Răspuns :
A lat = 2 · h ( L + l )
A lat = 2 · 5 ( 20 + 10 )
A lat = 10 · 30
A lat = 300 cm²
A tot = 2 · ( L · l + L · h + l · h )
A tot = 2 · ( 20 · 10 + 20 · 5 + 10 · 5 )
A tot = 2 · ( 200 + 100 + 50 )
A tot = 2 · 350
A tot = 700 cm²
Răspuns
A l = 300 cm²
A t = 700 cm²
Explicație pas cu pas:
A laterala = 2×h×(L+l)
A l = 2 × 5 × (20 + 10) = 10 × 30 = 300cm²
A totala = 2 × (L × l + L × h + l × h)
A t = 2 × (20 × 10 + 20 × 5 + 10 × 5) =
= 2 × (200 + 100 + 50) =
= 2 × 350 =
= 700 cm²