Question

A person moving in a circular path of radius covers 3÷4 of a circle. then it's distance and displacements are

Answer 1

Tell us what ‘a radius’ is and the problem is trivial. Let the radius be [math]r[/math]. The distance around the whole circle is [math]2\pi r[/math], so the distance around [math]\frac34[/math] of a circle is [math]\frac{3\pi}2r[/math]. The displacement vector is at [math]45[/math] degrees to the radius vector at the starting point and has length [math]\sqrt{2}r[/math].

Draw the diagram. You should not need to ask trivial questions.