3
21 - including one of 360 degrees.
10 rays can meet in 45 vertices. At each such vertex there will be 4 angles which makes 180 angles in all.
five
Eight angles are formed - four for each line that the transversal cuts through. 2*4=8. Hope this helps!
2
Six angles.
4 angles are formed
21 - including one of 360 degrees.
A semicircle itself does not have any right angles; it is a half-circle. However, if you consider the angle formed at the endpoints of the diameter when a line is drawn to any point on the arc of the semicircle, that angle is a right angle (90 degrees). Thus, while the semicircle itself has no right angles, it can form right angles with lines drawn to points on its arc.
if the rays have no common points, the answer is zero. if the rays all have the same end point, the answer is 21 -- counting only the acute angles.
4
two endpoints
Two pairs of opposite equal angles are formed
There are many angles inside a circle. You have inscribed angles, right angles, and central angles. These angles are formed from using chords, secants, and tangents.
A circle does not have angles in the traditional sense, as angles are formed by the intersection of two lines. However, if considering angles formed by radii and chords within the circle, it is possible to have infinitely many obtuse angles depending on the selected points on the circumference. Thus, the answer can be considered as infinite obtuse angles in a circle.
Four.
4