COS-C PRACTICE EXAM 2026 SOLVED QUESTIONS WITH FULL EXPLANATIONS

COS-C PRACTICE EXAM 2026 SOLVED
QUESTIONS WITH FULL EXPLANATIONS


◉Angles. Answer: Acute: less than 90 degrees
Right: exactly 90 degrees
Obtuse: between 90 and 180
Straight: exactly 180 degrees (line)
Reflex: between 180 and 360
Full: exactly 360


◉Complementary. Answer: Two angles whose sum is 90 degrees


◉Supplementary. Answer: Two angles whose sum is 180 degrees


◉Interior Angles. Answer: Angles between two parallel lines


◉Exterior Angles. Answer: Angles outside the parallel lines


◉Corresponding Angles. Answer: Angles that are in the same
position relative to the transversal and a parallel line

, ◉Alternate Interior Angles. Answer: The two interior angles that are
on opposite sides of the transversal


◉Alternate Exterior Angles. Answer: The two exterior angles that
are on opposite sides of the transversal


◉Polygons. Answer: Planar shapes formed from line segments called
sides that are joined together at points called vertices
# of Sides:
Triangle: 3
Quadrilateral: 4
Pentagon: 5
Hexagon: 6
Heptagon: 7
Octagon: 8
Nonagon: 9
Decagon: 10
Dodecagon: 12


◉Interior Angle. Answer: Any of the angles inside a polygon where
two sides meet at a vertex