Question

Determine whether each statement is always, sometimes, or never true. Explain.5. Two planes intersect at a point. 6. Three points are contained in more than one plane. 7. If line m lies in plane x and line m contains a point Q, then point Q lies in plane x.8. If two angles are complementary, then they form a right angle.

Answer 1

5. Two planes always at a line not a point so the statement is never true.

6. Three points can be contained in one plane or mor than one plane as point can lie anywhere in the space, so this statement is sometimes true.

7. If line m lie in the plane then all the points on the line lie on the plane. So point Q which lie on the line also lies on the plane. So statement is always true.

8. The complementary angle is of 90 degree. So it form a right angle. Hence this statement is always true.