Answer:
2) total area:
A = 2Ll + 2Lh + 2lh
A = 2(7*5) + 2(5*3) + 2(7*3)=
A=2(35+15+21)=142ft²
side surface:
To calculate the lateral surface of the rectangular parallelepiped, we multiply its base perimeter by its height:
2(5+7)*3=72cm²
3) Total area:
it is a question of calculating the area of one of the faces and multiplying it by 6
base area =2.5²
total area = 2.5²*6=37.5cm²
Lateral area:
just calculate the area of one and multiply it by 4 to get the lateral area.
multiply the area of the face by 4
2.5²*4=25cm²
4) total area:
A = 2Ll + 2Lh + 2lh
A = 2(5*5) + 2(5*10) + 5(5*10)
A = 2*25 + 2*50 + 5*50
A = 50+100+250 =400cm²
Lateral area:
4*5*10= 200cm²