Hi Kamlesh, A rectangle is a quadrilateral. The sum of all interior angles of any quadrilateral is $360^{\circ}$. Each angle of a rectangle is ${9 0}^{\circ}$. Therefore, $90^{\circ}+90^{\circ}+90^{\circ}+90^{\circ}=360^{\circ}$.
The sum of all interior angles of a rectangle is 360°.
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