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In this image r^2=R^2+x^2(a/c to book)

but how

is the angle mentioned is right angle?

because pythagoras theorem is only for right angles as my knowledge?

Hi Muhammad,

The Theorem of Pythagoras is indeed only for right-angled triangles. The picture is a three-dimensional scenario, so the angle does not look like a right angle. If you don't look at a right angle head-on, it won't appear to be a right angle. If you need to, draw only the xy-plane and you will see the right angle.

The angle is indeed a right angle, and the Theorem of Pythagoras can be applied.

Thanks for asking,

Azeem

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