A quadrilateral has all its four angles of the same measure. What is the measure of each?
Let each equal angle of a quadrilateral = x ∴4x∘=360∘⇒x∘=360∘4=90∘ ∴ Each angle will be =90∘ Ans.
A quadrilateral has three acute angles each measures 80∘. What is the measure of fourth angle?