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Does fourth dimension really exist?
Yes. The 4th dimension is time. According to String Theory (which is unverified), there may be as many as 11 dimensions, but dimensions above the fourth are hypothetical.
How did Inca make such precise calculations in astronomy architectural engineering and mathematics?
They recorded numbers using the knots on a string called a quipu.
Is the string a two dimensional or a three dimensional object?
Considering it mathematically string is nothing but a line... So it only has one dimension that is length.. considering it physically.. It is nothing but a metal ROD.. with a given Diameter so it has three degrees of freedom hence it is a 3D structure..
How do you draw a oval?
Use a Pencil, a string, and 2 nails (or tacks). Mount the 2 nails(or tacks) on a drawing surface. Tie a string into a loop such that it will go around the 2 nails with plenty of extra slack. Lay the string so it encircles the 2 nails. Using your pencil, place it inside the string and pull it one direction so the string loop forms a triangle between 1 nail, the other nail and the pencil point. Now move the string around the nails while keeping the string pulled tight. The pencil will trace an Ellipitcal oval shape.
What would happen if there was a time paradox?
Given the current views on time a true paradox would produce alternate dimensions of the current dimension where the paradox occurred thus preventing the total collapse in maintainable constructs and viable alternatives for that particular string.
