Respuesta :
Answer:
The required foil is about [tex]2ls+lb[/tex] sq units.
Step-by-step explanation:
Given:
A triangular prism covered with foil.
To Find:
If two ends are not covered how much foil is required.
Solution:
The triangular prism has total of 5 faces as
two side faces ............... Rectangular shape
one bottom face.............rectangular shape
two side faces............ triangular face.
(Refer the attachment for diagram)
Area of triangle =[tex]1/2(base*height)[/tex]
Now there 2 traingles so
Total are for triangle =[tex]base * height[/tex]
Area for bottom rectangle,
=length *breadth
[tex]=l*b[/tex]
Area for 2 side rectangles,
=2*(length * breadth)
=2*(l*S)
[tex]=2*l*S[/tex]
Hence required area =total area -area of triangle
(As triangles are presented at both ends) and as per condition.
[tex]=(2ls+lb+bh)-bh[/tex]
[tex]=2ls+lb[/tex].
