Which of these tools or constructions is used to inscribe a square inside a circle? a. parallel line through a point b. equilateral triangle c. perpendicular bisector d. rotational symmetry

One way to inscribe a square in a circle would be to draw two perpendicular diameters and connect the intersections of the diameters with the circle. To draw a diameter, draw the perpendicular bisector of any chord on the circle. To draw a second diameter, perpendicular to that one, draw the perpendicular bisector of the first diameter.
To summarize: one method of inscribing a square in a circle is to draw any chord on the circle, draw the perpendicular bisector of that chord, then draw the perpendicular bisector of the perpendicular bisector. Connect the intersections of the two perpendicular bisectors with the circle to fo the desired square. This method involves only the perpendicular bisector, so C is the answer.
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the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.