Measure the radius and multiply by 2
Measure the circumference and divide by pi
Measure the width across the widest part of the circle
Use the formula diameter = 2 × radius
Use the formula diameter = circumference ÷ pi
Measure the radius and multiply by 2
Measure the circumference and divide by pi
Measure the width across the widest part of the circle
Use the formula diameter = 2 × radius
Use the formula diameter = circumference ÷ pi