Question

20 points.

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Answer 1

Dude, during earlier days, the cylinders were filled with 2% oxygen and 98% helium (helium has less solubility in blood). Now-a-days, the composition is 11.7% helium, 56.2% nitrogen and 32.1% oxygen (This is in a GK book called Lucent's General Knowledge).

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Answer 2

Answer✔️

When a circle is inscribed in a square , the diameter of the circle is equal to the side length of the square. You can find the perimeter and area of the square, when at least one measure of the circle or the square is given.

Answered by:- @BrainlyParrot