Respuesta :
78, because 324 divided by 12 is 27. this means that the width is 12 and the length is 27. 27 times 2 equals 54 and 12 times 2 equals 24. 54+24= 78
Answer:
78 inches of ribbon does Mrs. Martin need
Step-by-step explanation:
Area of a rectangle (A) is given by:
[tex]A = lw[/tex] .....[1]
where,
l is the length of the rectangle and w is the width of the rectangle.
As per the statement:
The area of the mirror is 324 square inches. The width of the mirror is 12 inches.
⇒A = 324 square inches and w = 12 inches.
By [1] we have;
[tex]324 = 12l[/tex]
Divide both sides by 12 we have;
27 = l
or
l = 27 inches
We have to find the inches of ribbon does Mrs. Martin need.
Perimeter of the rectangle(P) = 2(l+w)
Substitute the given values we have;
[tex]P = 2 \cdot (27+12) = 2 \cdot 39 = 78 in[/tex]
Therefore, 78 inches of ribbon does Mrs. Martin need
