SWBAT write an equation of a circle (G.12)

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Presentation transcript:

SWBAT write an equation of a circle (G.12)

Copy into your SOL binder (day 5) Answer: Center (0, 2) (-5, 2) or (0, 7) or (5,2) or (0, -3)

Copy this into SOL binder (day 5) Answer: C

Answer: (x+3)2 + (y+1)2 = 25 Copy this into SOL binder (day 5)

A circle has a center at (-1, 4) and a diameter of 20. Select each pair of coordinates that represent a point on this circle. (-7, -4) (11, 20) (19, 16) (5, 12) (-9, -2) (-1, 4) (-7,-4) (5, 12) (-9, -2)

p.p.

is a diameter of the circle where A(-3, 2) and B(5, 4). Write the equation of the circle. Now, graph the circle (be precise)! Center = Midpt of the diameter ∴ use the midpt formula (1, 3) Radius is the distance from the center to a point on the circle. ∴ use the distance formula

Given: (x + 5) 2 + (y – 2) 2 = 64 Center (-5, 2)Radius 8 Which points lie on the circle? (-5, 10) (0, -2) (-5, -8) (0, 9) (-15, -5) (3, 2)

Given: (x + 2) 2 + (y – 3) 2 = Identify the center 2. Find the radius 3. Plot on point on the circle 4. Now, connect Points….is it a circle? Ellipse?

Let’s Practice: Workbook p. 327 (3, 4, 10, 14, 15- be careful of the scale, 20, 24, 28, 29)