CK-12 Geometry - Second Edition, Volume 1 of 2 by CK-12 Foundation

By CK-12 Foundation

CK-12’s Geometry - moment variation is a transparent presentation of the necessities of geometry for the highschool pupil. issues comprise: Proofs, Triangles, Quadrilaterals, Similarity, Perimeter & quarter, quantity, and adjustments. quantity 1 contains the 1st 6 chapters: fundamentals of Geometry, Reasoning and facts, Parallel and Perpendicular strains, Triangles and Congruence, Relationships with Triangles, and Polygons and Quadrilaterals.

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Example text

By its angles, they all look acute, so it is an acute triangle. Typically, we say this is an acute isosceles triangle. Example 5: Classify the triangle by its sides and angles. Solution: This triangle has a right angle and no sides are marked congruent. So, it is a right scalene triangle. Polygons Polygon: Any closed planar figure that is made entirely of line segments that intersect at their endpoints. Polygons can have any number of sides and angles, but the sides can never be curved. The segments are called the sides of the polygons, and the points where the segments intersect are called vertices.

Example 6: Which of the figures below is a polygon? Solution: The easiest way to identify the polygon is to identify which shapes are not polygons. and each have at least one curved side, so they cannot be polygons. has all straight sides, but one of the vertices is not at the endpoint of the adjacent side, so it is not a polygon either. is the only polygon. Example 7: Which of the figures below is not a polygon? Solution: is a three-dimensional shape, so it does not lie within one plane, so it is not a polygon.

The distance between and is labeled as or , where means measure. and can be used interchangeably. In this text we will primarily use the first. Ruler Postulate Ruler Postulate: The distance between two points will be the absolute value of the difference between the numbers shown on the ruler. The ruler postulate implies that you do not need to start measuring at “0”, as long as you subtract the first number from the second. “Absolute value” is used because distance is always positive. Example 3: What is the distance marked on the ruler below?

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