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Here ,a/c to pythagoras theorem ,r^2=a^2+x^2

but how

is the angle mentioned is right angle?

Hi Muhammad,

The x- and y-axes intersect at a right angle. We choose to set up the axes this way to make calculations easier. Bear in mind, this is a three-dimensional scenario illustrated, so the angle does not look like a right angle.

I hope I have understood and answered your question. If not, feel free to ask a follow-up.

Thanks for asking,

Azeem

I welcome your questions on algebra, 2D and 3D geometry, parabolic functions and conic sections, and any other mathematical queries you may have.

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