Three angles of a quadrilateral are equal. The fourth angle is twice one of the angles.
Find the measure of largest angle.
Let the measure of other equal angles be x∘.
Fourth angle = 2x∘
The sum of all the angles of a quadrilateral is 360∘.
Thus, the measure of the three equal angles is 72∘.
Measure of fourth angle = 2x∘ = 144∘
Therefore, 144∘ is the largest angle.