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STAAR Readiness Standard: Grade 8 Math (8.9 B) Name: Date: Objective: Students will use proportional relationships in similar two-dimensional figures or similar three-dimensional figures to find missing measurements. Academic Vocabulary: After watching the Brain POP: Similar Figures movie, explain the terms below in your own words. 1. Geometrically Similar: To have the same shape but not necessarily the same size 2. Equilateral Triangle: A triangle that has 3 sides of equal length and 3 equal angles 3. Scalene Triangle: A triangle with 3 different side lengths and 3 different angles 4. Congruent: Equal in size, shape or both 5. Proportional: The same in length 6. Scale Factor: Simplify the ratio between any two corresponding measurements, not including angles 7. Indirect Measurement: The way to measure things that are way too big to measure directly 8. Choose an additional term from the movie to define: Angle: The measurement of points on a shape 9. The Orlando Magicâ€™s court is similar to a playground court. The ratio of the corresponding side lengths is 10:7. What is the ratio of the areas? Answer: 30:21 If two figures are similar, then the ratio of their areas is equal to the square of the ratio of their corresponding side lengths. 10 7 10. The ratio of the corresponding side lengths of two similar computer screens is 13:15. The perimeter of the smaller screen is 39 inches. What is the perimeter of the larger screen? Answer: 45 Name: Date: Objective: Students will use proportional relationships in similar two-dimensional figures or similar three-dimensional figures to find missing measurements. 15 13