Question:
Three angles of a quadrilateral are equal and the measure of the fourth angle is 120°. Find the measure of each of the equal angles.
Solution:
Three angles of a quadrilateral are equal and the measure of the fourth angle is 120°.
Find the measure of each of the equal angles.
$\therefore x+x+x+120=360$
$3 x+120=360$
$3 x=240$
$x=\frac{240}{3}=80$
Each of the equal angles measure 80°.
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