'Similar pentagons' presentation slideshows

7-1 Ratios and Proportions

7-1 Ratios and Proportions. The ratios of the angles in ? ABC is 3:5:7. Find the measure of the angles. Triangle Angle Sum=180?. 36+60+84 = 180 true. The ratios of the angles in quadrilateral is 2:4:6:3 Find the measure of the angles. Quad. Angle Sum=360?. 48+96+144 +72= 360 true.

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Created by Mandy Plunkett Modified by Charlotte Stripling

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Hot Topics page 411

Hot Topics page 411. Numbers 1-10. Give the scale factor. 25 20. 20 16. 4 5 . 25/20 = 5/4 or 20/16 = 5/4. Give the scale factor. 14 14 14. 10 10 10. 7 5. 10/14 = 5/7.

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Section 11-3

Section 11-3. Perimeters and Areas of Similar Figures. Recall:. Two polygons are similar iff corresponding angles are congruent and the lengths of corresponding sides are proportional. The ratio of the lengths of two corresponding sides of two similar polygons is called the scale factor.

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The triangles below are similar. Find the ratio (larger to smaller) of their perimeters and of their areas.

5 4. From larger to smaller, the similarity ratio is . By the Perimeters and Areas of Similar Figures Theorem, the ratio of the perimeters is also , and the ratio of the areas is , or . 5 4. 25 16. 5 2 4 2. Perimeters and Areas of Similar Figures. LESSON 10-4.

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