What is the size of the kitchen pot (22cm, 24cm), inner diameter or outer diameter?

The diameter of the inner circle of a circular object is called the inner diameter, which is usually measured directly with a micrometer or vernier caliper with the symbol φ. The outer diameter is the outer diameter, and the symbol is φ.

The size of the kitchen pot refers to the inner diameter of the upper edge of the pot. The inner diameter of the steamer is 23cm, and the original steamer should be 24cm. Generally, with the different shapes of steamer and steamer, steamer is smaller than steamer by about 1cm. In addition, if you use a steamer with a steamer, you must pay attention to the matching of the original steamer and the steamer, otherwise it will easily lead to a loose cover.

Extended data:

The diameter of the same circle is twice as long as the radius, which can be expressed as d=2r or r=d/2.

Prove that there is a diameter AB, and according to the definition of diameter, the center O is on AB. ∵AO=BO=r,∴AB=2r

Moreover, in the same circle, chords whose chord length is twice the radius are all diameters. That is, if the line segment d=2r(r is the radius length), then d is the diameter.

Reduction to absurdity: Assuming that AB is not a diameter, then the intersection O is the diameter AB'. According to the above conclusion, AB'= 2r = AB.

∴∠ABB'=∠AB'B (equilateral and angular)

And ∵ab' is the diameter, ∴ ∠ abb' = 90 (the circumferential angle opposite to the diameter is a right angle).

Then there are two right angles in △ ABB', which contradicts the theorem of sum of internal angles.

∴ If the assumption is not true, AB is the diameter.

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