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In the following diagram what is the value of x?

A 45°
Explaination
When added, the interior angles of a triangle will equal 180°. From the question and the diagram, we state this property as: 90 + 45 + x = 180 Solving for x: x = 180 - 90 - 45 x = 45°
B 15°
C 90°
D 60°