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## Welcome t o AREA 51

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**Using Student Responders**To respond to a question: • Wait for polling to open. • Select your response • You do not have to turn on your responder, it is ready to go.**Crop circle image 1**Insert image of a crop circle design. Example: http://science.howstuffworks.com/science-vs-myth/unexplained-phenomena/crop-circle.htm**Example crop circles can be**foundathttp://www.stonehenge-stone-circle.co.uk/crop-circles.htm**Crop circle example can be found at**http://www.ufo-reports.com/crop-circles.html**Why Circles?**• They are cool to look at. • Farmers are able to plant more crops. • Crops grow better in circle plots. • Crops are watered more efficiently.**Why Use Center Pivot Systems?**PROS (advantages) CONS (disadvantages)**Why So Close?**• Farmers want to make the most of limited space. • We have plenty of land • It is easier for farmers. • It is easier to construct the irrigation system**What is Area?**• The distance around a shape. • The amount of 2-D space inside a boundary. • The amount of 3-D dimensional space an object occupies. • The sum of the sides of a shape.**An Area Answer Tells Us . . .**• How many square units are in a 2-D space. • How many cubic units are in a 3-D space. • How many units are in a line.**Area fill-in1**1 square = 1 square meter**Area fill-in1**AREA: AREA: AREA:**Area of a Parallelogram?**• Base●Height • Side+Side+Side+Side • Length÷Width • ½ (Base●Height)**Formula chart**Base •Height bh**Area of a Triangle?**• base•height • base•height • 2•base•height • base•height**Formula chart**½Base • Height (½ bh)**Area of a Circle?5**RED: Half the circumference =Length ORANGE:Radius = Width**Area of a Circle?**• • r • r= r2 • 2r • r • 2r • r = 2r2**ORANGE:**Radius = Width RED: Half the circumference =Length**Percent of Farm NOT Used**Farm Area 2.70 km2 Farm NOT Used .91 km2**33.7% Farm Not Used**Farm NOT Used .91 km2 Farm Area 2.70 km2 .337 ● 100= .91÷ 2.70= 33.7%