Scale Factor of Similar Polygons


Learn how to recognize the ratio of corresponding side lengths of similar figures as scale factor.

Grade 7 Material from CK-12

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Standards

7.G.A.1

Solve problems involving scale drawings of geometric figures, such as computing actual lengths and areas from a scale drawing and reproducing a scale drawing at a different scale.

HSG.SRT.A.2

HSG.SRT.B.5

7.RP.A.3

Use proportional relationships to solve multistep ratio and percent problems. Examples: simple interest, tax, markups and markdowns, gratuities and commissions, fees, percent increase and decrease, percent error

8.EE.B.6

Use similar triangles to explain why the slope m is the same between any two distinct points on a non?vertical line in the coordinate plane; derive the equation y = mx for a line through the origin and the equation y = mx + b for a line intercepting the vertical axis at b.