Answer:
[tex]47.3\,m[/tex] of garland is required for the length of the ceiling.
Step-by-step explanation:
Width of a rectangle ceiling [tex](w)=42 \,m[/tex]
Diagonal of a rectangle ceiling [tex](d)=70\,m[/tex]
Let [tex]l[/tex] denotes length of a rectangle ceiling.
The relationship between length, width and diagonal of a rectangle is given as follows:
[tex]d^2=l^2+w^2\\70^2=l^2+42^2\\4900=l^2+1764\\l^2=4900-1764\\l^2=2236\\l=47.3\,m[/tex]
So,
[tex]47.3\,m[/tex] of garland is required for the length of the ceiling.
