Sketches and Constructions

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Presentation transcript:

Sketches and Constructions Lesson 1.7 Sketches and Constructions pp. 32-35

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

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.

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

1. Sketch a semicircle.

2. Draw a semicircle.

3. Construct a semicircle.

4. Sketch a square.

5. Draw a square.

Homework pp. 34-35

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

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

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

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

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