That's a sphere.
sometimes
Because their angles are factors of 360 and angles around a point add up to 360 degrees
No. Only 2 altitudes can intersect at a point. * * * * * True but even they do not meet in the interior. The altitudes of a right angles triangle meet at the right angled vertex. The vertex is at the boundary of the triangle, not in the interior.
Angles that share a common end point and a common line segment but no common interior point (two angles that are next to each other)
A point has no interior and so cannot have interior angles.
C
A concave quadrilateral
In which region of the Earth's interior does the heat increase to the point that rocks can begin to melt?
In which region of the Earth's interior does the heat increase to the point that rocks can begin to melt?
The incentre.
Ami Arbel has written: 'Exploring interior-point linear programming' -- subject(s): Data processing, Interior-point methods, Linear programming
The usual notation is that the central letter is the point of the angle, so P is the answer.
the focus
line
Focus or Hypocenter
Stephen J. Wright has written: 'Primal-dual interior-point methods' -- subject(s): Linear programming, Mathematical optimization, Interior-point methods