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Keeping equal pressure on both sides of the eardrum is known as maintaining ear pressure equilibrium. This balance is achieved through the Eustachian tube, which connects the middle ear to the back of the throat. Proper pressure regulation is essential for normal hearing and to prevent discomfort or damage to the eardrum, especially during changes in altitude, such as during flying or diving. When the Eustachian tube functions correctly, it helps equalize pressure, allowing the eardrum to vibrate freely.
scalene has no equal sides
A regular pentagon has have equal sides. However, in the same way that a square has four equal sides but you can have a four sided figure with equal sides which is not a square, you can have pentagons that are not regular but do have equal sides. Unlike the quadrilateral, which is called a rhombus, there is no special name for a pentagon that has equal sides but not equal angles.
A parallelogram with equal sides is a rhombus.
the length of the sides on a square would be equal, a rectangle IS a quadralateral, but the sides lengthwise are not equal to the sides widthwise