Question

A rectangle is 9 centimeters long and 5 centimeters wide. What is the diameter?

Answer 1

A rectangle doesn't has a diameter

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But if you are asking about perimeter.

Explanation:

Perimeter = 2(l + b)

l = 9cm

b = 5cm

Perimeter = 2(l + b)

= 2(9 + 5)

= 18 + 10

= 28cm