# New PDF release: CK-12 Geometry - Second Edition, Volume 2 of 2

By CK-12 Foundation

CK-12’s Geometry - moment variation is a transparent presentation of the necessities of geometry for the highschool pupil. subject matters comprise: Proofs, Triangles, Quadrilaterals, Similarity, Perimeter & quarter, quantity, and adjustments. quantity 2 contains the final 6 chapters: Similarity, correct Triangle Trigonometry, Circles, Perimeter and zone, floor zone and quantity, and inflexible alterations.

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**Extra info for CK-12 Geometry - Second Edition, Volume 2 of 2**

**Example text**

Solution: This looks like an obtuse triangle, but we need proof to draw the correct conclusion. Use the distance formula to find the length of each side. Now, let’s plug these lengths into the Pythagorean Theorem. is an obtuse triangle. Know What? Revisited To make the walls perpendicular, find the length of the diagonal. In order to make the building rectangular, both diagonals must be 97 feet. Review Questions The two shorter sides of a triangle are 9 and 12. What would be the length of the third side to make the triangle a right triangle?

Also, the angle where the sun’s rays hit the ground is the same for both. The two trianglesare similar. Set up a proportion. The height of the flagpole is 51 feet. Review Questions Use the diagram to complete each statement. Answer questions 6-9 about trapezoid . Name two similar triangles. How do you know they are similar? Write a true proportion. Name two other triangles that might not be similar. If and , find . Be careful! Writing How many angles need to be congruent to show that two triangles are similar?

Are the two diamonds similar? If so, what is the scale factor? Explain your answer. Similar Polygons Similar Polygons: Two polygons with the same shape, but not the same size. Think about similar polygons as an enlargement or shrinking of the same shape. So, more specifically, similar polygons have to have the same number of sides, the corresponding angles are congruent, and the corresponding sides are proportional. The symbol is used to represent similar. Here are some examples: These polygons are not similar: Example 1: Suppose .