Lesson 7-1: Ratios of Similar Polygons

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Lesson 7-1: Ratios of Similar Polygons Rigor: Determine if 2 figures are similar, determine the similarity ratio, scale factor, and calculate side lengths of similar polygons Relevance – Indirect measurement and scale models

What are Similar Figures? Corresponding angles are congruent and corresponding side lengths are proportional Basically, they have the same shape, but not necessarily the same size Symbol is ~ Turn to page 281 in the workbook for examples 1 & 2

Scale Drawings Scale Drawings/models – all drawing/model lengths are proportional to corresponding actual lengths Ratios (Scales) of scale drawings can have different units! Example = 1cm : 200m

Ex 3: Scale Drawings A boxcar has the dimensions shown. A model of the boxcar is 1.25in wide. Find the length of the model to the nearest inch.

Ex 4: Scale Drawings The Seattle Space Needle is 605ft tall. Timmy decides to make a scale drawing on an 8.5in by 11in piece of paper. If Timmy chooses a 1in : 50ft scale, is his paper big enough?

7-1 Classwork Workbook pg283 #1 – 3 and pg286 ALL

Honors: 7-1 Assignments Primary Assignment: join.quizizz.com Codes: Period 1: 372678 (due Thursday) Period 5: 684851 (due Thursday) Period 6: 157112 (due Friday) Secondary Assignment: Workbook pg285 ALL

Standard: 7-1 Assignments Primary Assignment: join.quizizz.com Codes: Period 2: 621267 (due Friday) Period 4: 832519 (due Friday) Period 7: 848115 (due Friday) Secondary Assignment: Workbook pg285 ALL