May things, but the probable answer sought here is a diameter of a circle, at the circumference of the circle.
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An angle subtended at the semicircular arc is 90 degrees.
A 90 degree angle is a right angle
an angle subtended by an arc is double at the center
A right-angle is a 90 degree angleA right triangle has one, and a 90-degree angle isone.
Fifty degrees. 90+40+90=180