Geometry Dimensional Change in Area

Geometry Dimensional Change in Area

By Mrs. Swain - Clear Lake High School

​Dimensional Change

​What is the area of this Rectangle?

​Dimensional Change

​What if the dimensions were doubled?

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​So what is the rule?

The area's change is the dimensional's changed squared.​

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​Another way to say that...

Area factor = Similiarity factor X similiarity factor​

​or...

Multiply the area by the similarity factor and then again by similarity factor.​

​What it looks like

If the dimensions were doubled... then the area would be doubled X doubled

Area would be multiplied by 2x2 = 4​

Multiple Choice

A polygon's dimensions change by 2/5, what happens to the area?

• The area changes by 2/5

• The area changes by 4/25

• The area changes by 4/10

• The area changes by 4/5

• The area changes by 2/10

Multiple Choice

If there was a polygon and the dimensions were multiplied by 4, what would happen to the area?

• area multiplied by 4

• area multiplied by 8

• area multiplied by 16

• area multiplied by 32

• I still don't know

Multiple Choice

A polygon's dimensions change by 5/3, what happens to the area?

• The area changes by 5/3

• The area changes by 10/9

• The area changes by 25/3

• The area changes by 10/6

• The area changes by 25/9

Multiple Choice

If there was a polygon and the dimensions were multiplied by 7, what would happen to the area?

• area multiplied by 7

• area multiplied by 17

• area multiplied by 49

• area multiplied by 98

• I still don't know