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Circles

September 30, 2019

We looked at a sprinkler video in grade 10 and then looked at where to place he sprinkler head to make sure that each plant (A,B,C,D) would get watered.

We used the perpendicular bisector (médiatrice) to show all the points that are equidistant to 2 plants. All of these lines intersected nicely to show where to put the sprinkler.

If we wanted to show all of the places that would get watered, we knew that it would be a circle.

We also developed an equation for the circle x^2+y^2=r^2 by using the pythagorean theorem. We know r is the radius. This works for all circles with a center at (0,0).

We can plug in a point (x,y) and calculate r, or we can plug in x and r and calculate y. Our homework will focus on circles to give us lots of practice.

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