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# 2 8 Bzca5e

## on Jan 30, 2010

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## 2 8 Bzca5ePresentation Transcript

• Section 2.8 Distance and Midpoint Formulas; Circles
• The Distance Formula
•
•
• Example Find the distance between (4,-5) and (9,-2).
• The Midpoint Formula
• (-1,5) (6,8)
• Example Find the midpoint of the segment whose endpoints are (-1,7) and (-5,9).
• Circles
•
• Graphing Calculator
• Write the standard form of the equation of the circle with center (-4,1) and radius of 3. Standard Form (-4,1) 3
• Find the center and radius of the circle whose equation is Graph the equation. Use the graph to identify the relation’s domain and range. Why is it a relation and not a function? 3 (-3,4) Domain: [-6,0]; Range:[1,7] Center(-3,4); radius=3
• Example Write the standard form of the equation of the circle with center at (-2,7) and a radius of 5.
• Example Find the center and radius of the circle whose equation is below. Graph the equation. Use the graph to identify the relation’s domain and range.
• General Form
• ? ?
• Example Complete the square and write the equation in standard form. Then give the center and radius of the circle and graph the equation.
• Example Complete the square and write the equation in standard form. Then give the center and radius of the circle and graph the equation.
• (a) (b) (c) (d) Find the distance between the points (-1,8) and (9,5).
• (a) (b) (c) (d) Find the midpoint of the line segment with the endpoints of (-1,-1) and (- 5,8).
• (a) (b) (c) (d) Write the equation of the line with center at (0,7) and a radius of 4.