Most quadrilaterals. The only exceptions are rectangles (including squares).
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The 3rd angle of the triangle could be 90 degrees because the 3 angles in a triangle add up to 180 degrees.
the letter C lies on top, the first point of the angle. A is the "vertex" it connects both lines to form an angle the bottom could be letter B. "<" that's an angle. B and C could never be on the Vertex.
A rhombus, trapezoid or parallelogram could all contain a 45 degree vertex. Squares and rectangles only have 90 degree vertices.
trapezoid, parallelogram, and rhombus (people call it the diamond)
a right angle is 90 degrees a straight angle is 180 degrees you could also use a anglicize