So you want to use a proportion…

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Presentation transcript:

So you want to use a proportion… It’s easy!

UNITS!!! cm Km cm Km Start with your formula = Actual Height of Feature Relief Globe Height of Feature = Actual Earth Diameter Relief Globe Diameter cm Km UNITS!!!

UNITS!!! Then just substitute and cross-multiply! = 8.8 km X cm 124.08 = 12,756X 12,756 12,756 9.73 x 10-3 cm = X UNITS!!!

But what is that number? 9.73 x 10-3 cm Move the decimal three places left! 0.00973 cm Just for kicks, how many millimeters? There are 10 mm in one cm. Move the decimal one place to the right. 0.0973 mm

You’re done! Now you can eat corn! Try this: A town, not too far from here, wants to build a scale statue of their town mascot, the emu (Dromaius novaehollandiae). The model is 14 cm tall, and the scale is 1 cm = 1.2 m. How tall, in meters, will the actual statue be? 16.8 m