CK12 - Geometry

Scaledrawingsand modelsare widelyusedin design,construction,manufacturing,and manyotherfields.

Sometimesa scaleis shown,such as “ inch miles”on a map.Othertimesthe scalemay be calculated,
if necessary, from informationaboutthe objectbeingmodeled.

Example 3

Jakehas a map for a bike tour. The scaleis inch miles.He estimatedthat two scenicplaceson the

tour wereabout inchesaparton the map.How far apartare theseplacesin reality?

Eachinch on the map representsa distanceof miles.The placesare about milesapart.

Example 4

Cristy’s designteambuilt a modelof a spacecraftto be built.Theirmodelhas a scaleof. The actual

spacecraftwill be feet long.How long shouldthe modelbe?

Let be the lengthof the model.

The modelshouldbe feet long.

Example 5

Tashais makingmodelsof severalbuildingsfor her seniorproject.The modelsare all madewith the same
scale.She has startedthe chartbelow.

a.Whatis the scaleof the models?

The scaleis inch feet.

b.Completethe chartbelow.

Building Actualheight(feet) Modelheight(inches)

SearsTower?

(Chicago)

EmpireStateBuilding

(NewYork City)

ColumbiaCenter?