Chapter 3: Q1 (page 89)
Two lines that do not intersect are parallel.
Short Answer
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Chapter 3: Q1 (page 89)
Two lines that do not intersect are parallel.
The blank should be filled with sometimes.
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Draw a triangle that satisfies the conditions stated. If no triangle can satisfy the conditions, write not possible.
2. a. An acute scalene triangle.
b. A right scalene triangle.
c. An obtuse scalene triangle.
Draw a pentagon with one exterior angle at each vertex. Cut out the exterior angles and arrange them so that they all have a common vertex, as shown at the far right. What is the sum of the measures of the exterior angles? Repeat the experiment with a hexagon. Do your results support Theorem 3-14?

Draw each figure described.
42. Lines Iplane X, plane Xplane Y, and I is not parallel to Y.
The cover of a soccer ball consists of interlocking regular pentagons and regular hexagons, as shown at the right. The second diagram shows that regular pentagons and hexagons cannot be interlocked in this pattern to tile a floor. Why not?

The sum of the measures of the interior angles of a polygon is known to be between 2100 and 2200. How many sides does the polygon have?
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