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[tex] \large\underline \bold{{SOLUTION}}[/tex]
First We will find the value of the width
Now that We knew the width , We will use the pythagorean theorem to find the diagonal.
[tex]\longmapsto\rm{a²+b²=c²}[/tex]
[tex]\longmapsto\rm{12²+9²=c²}[/tex]
[tex]\longmapsto\rm{144+81=c²}[/tex]
[tex]\longmapsto\rm{225=c²}[/tex]
[tex]\longmapsto\boxed{\rm{15=c}}[/tex]
Notice that in a rectangle , the diagonals are equal.
[tex]\implies\sf{Diagonal_1+Diagonal_2=Sum}[/tex]
[tex]\implies\sf{15m+15m=Sum}[/tex]
[tex]\implies\sf{30m=Sum}[/tex]
[tex] \large\underline{ \bold{ANSWER}}[/tex]