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How do you measure diameter?
Internal diameter.
What is used to measure internal diameter of a cylindrical object?
An internal caliper gauge.
How do you measure circumference of a bottle?
Circumference = 2*pi*r r(radius) * 2 = diameter So. assuming the bottle is fairly a circle, measure across the bottom to get the diameter and then divide that in half for the radius and use the circumference formula. Of course a bottle is not quite a perfect circle everywhere and you might need calculus to get a proper circumference. I am thinking vector calculus.
What difficulties will you face by using a meter rod to measure the internal diameter and internal depth of a breaker?
A meter rod may not fit cross-wise inside a breaker (whatever that is).
What is external diameter?
The diameter is the measurement of a line that goes right through a circle, through the centre point. In cases where we have a ring or some other such object with multiple circles, we would have an external diameter and an internal diameter. The internal diameter is the diameter of the inner circle. The external diameter is the diameter of the outer circle.
