1. Two flat surfaces intersect to form a(n) _______________. a. plane b. point c. line d. corner 2. A flat surface is a(n) ____________. a. plane b. line c. point d. area 3. Two lines intersect to form a(n) _______________. a. line b. plane c. corner d. point 4. Two points determine a(n) ____________. a. plane b. straight line c. curved line d. infinity 5. There are only a finite number of lines that can be drawn through a given point. True False Through a given point, one may draw an infinite amounof lines. 6. A midpoint ____________ a line segment. a. crosses b. cuts through c. bisects d. joins 7. Which of the following is the point where an angle originates? a. bisector b. vertex c. side d. obtuse 8. Lines that form right angles are called _________________. a. obtuse b. supplementary c. perpendicular d. bisector 9. A pair of angles having a sum equal to a straight angle are supplementary. True False 10. An angle that is less than a straight angle but greater than a right angle is a(n) ____________ angle. a. acute b. exterior c. obtuse d. opposite 11. The term "oblique" can _____________ be used to describe a right angle. a. always b. sometimes c. never 12. The size of an angle is determined by ____________________. a. the length of the sides of the angle b. the amount of rotation of the sides c. none of the above