1.2 Points, Lines, and Planes

1. 1.2 Points, Lines, and Planes

2. Warmup - • ENTER ROOM # 195236 • In your groups, see if you can figure out the pattern..answer in Socrative • 2, 6, 7, 21, 22, 66, 67 ___, ___ • 1, 3, 7, 15, 31, ___, ___

3. Learning Target • I can identify if points are collinear or coplanar given a geometric figure.

4. Point – a location; a point has no size and it is represented by a small dot and is named by a capital letter.

5. Line – a series of points that extend in opposite directions without end. It is named by any two points on the line. EX: • Collinear – points that lie on the same line. Any two points are collinear.

6. Need to know • Through any two points there is exactly one line. • If two lines intersect, then they intersect in exactly one point.

7. Identifying Collinear Points

8. Plane – a flat surface that has no thickness. A plane contains many lines and extends without end in the directions of all its lines. A plane is named by either a single capital letter or by at least 3 non-collinear points.

9. Coplanar – points and lines in the same plane Any three points are coplanar

10. Naming a Plane • Lets practice naming a plane.

11. NEED to KNOW • If two planes intersect, then they intersect in exactly one line.

12. Naming a Plane • Lets practice finding the intersection of two planes.

13. Don’t forget about diagonal planes • Remember, 2 lines intersect at a point and 2 planes intersect at a line. • Remember through any 2 points is a line, through any 3 non-collinear points is a plane.

14. Khan Academy • Using your smart phone or tablet, go to the Khan Academy, • Geometry • Points, lines, planes, • Points, lines, planes again • Get 5 right in a row and show one of us that you get it.

15. Classwork/Homework • 1-2 Practice Worksheet skip #9

16. Homework, Due tomorrow • P. 13-14 #1-43