>>12749194Looking at it from that perspective it would have two right angles, because the tiny, tiny corner at the line would be perpendicular as the tangent there (i.e. basically an extension of that side) would be perpendicular to the upper line of the semicircle. I think the correct answer is false because angles only exist between two straight lines. You can say that the horizontal line makes two right angles with the vertical tangents on either side of the curve, but that is not actually the angle within the semi-circle.
