∆ADB is ~ ∆BEC because <D and <E are right angles which are equal to 90°.
What is a right angle?
A right angle is defined as an angle that is formed when two straight line are perpendicular at an intersection creating a 90° angle when measured.
From the diagram, ∆ADB is ~ ∆BEC because <D and <E are right angles which are equal to 90°.
Learn more about angles here:
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