Answer:
The answer is 660.4 millimeters
Explanation:
Diameter = 26 inches
From the question
1 inch = 25.4 mm
To find it's equivalent in millimeters multiply 26 inches by 25.4 millimeters and divide by 1 inch
so we have 26 inches as

Simplify
We have
26 × 25.4 mm
We have the final answer as
660.4 millimeters
Hope this helps you