Răspuns:
Explicație pas cu pas:
d = √(L²+l²+h²)
13 = √(L²+3²+12²) ()²
(13)² = (√(L²+3²+12²)) ²
169 = L²+9+144
169-153 = L²
L² = 16
L= 4 cm
At = 2(Lxl+lxh+hxL)
At = 2(4x3+3x12+12x4)
At = 2(12+36+48)
At =2x96
At = 192 cm²
V = Lxlxh
V = 4x3x12
V = 144 cm³