1. Sketches and Constructions
Lesson 1.7
Sketches and Constructions pp

2. Objectives:
1. To distinguish between sketches, drawings, and constructions.
2. To perform some elementary sketches, drawings, and constructions.

3. A sketch is a careful freehand picture made only with a writing instrument such as a pencil.
A drawing of a geometric figure is made with the use of tools.

4. A construction is a drawing made with the aid of only two instruments: an unmarked straightedge and a compass.

5. 1. Sketch a semicircle.

6. 2. Draw a semicircle.

7. 3. Construct a semicircle.

8. 4. Sketch a square.

9. 5. Draw a square.

10. Homework pp

11. ■ Cumulative Review 25. Which term describes skew lines:
Intersecting, complementary, disjoint,
equal, empty?

12. ■ Cumulative Review 26. Sketch the set statement A  B  C
using a Venn diagram.

13. ■ Cumulative Review 27. Sketch a pair of parallel planes and a
pair of intersecting planes.

14. ■ Cumulative Review 28. How many planes are determined by
four noncoplanar points where no
three are collinear?

15. ■ Cumulative Review
29. If A = {2, 4, 6} and B = {2, 4, 8}, describe the relationship between sets.