Recall that sum of two sides is greater than the third side.And the side against the larger angle is larger.
Think about properties of equilateral triangles.
Recall all the congruency criteria.
Draw the altitudes on equal sides and then use the properties of the triangle
Think about angle sum property.
Think how sides and the median of a triangle are related to each other.
Think about the angles of the rectangle.
Think about right order of all the criteria of congruency.
Think of all the characteristics of a rectangle
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