Answer:
The length of straw is 21 inches.
Step-by-step explanation:
Given :
Lengths of straw =
,
,
inches.
Perimeter of the triangle is
inches.
Perimeter of triangle is sum of three sides .
Thus, when we open the triangle we obtain the length of straw thus perimeter is the length of the straw.
Given x = 1.5 inches
Put in perimeter, we get,
Length of straw = Perimeter of triangle=
at x = 1.5 inches

Thus, the length of straw is 21 inches.