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Name the reflected image of RS in line l . 2.Name the reflected image of ST in line l . 3.Name the reflected image of RWT in line l . 4.Find the length of the image of MN under a dilation with scale factor r = –3 and MN = 9. - PowerPoint PPT PresentationTRANSCRIPT
1. Name the reflected image
of RS in line l.2. Name the reflected image
of ST in line l.3. Name the reflected image
of RWT in line l.4. Find the length of the image of MN under a dilation with
scale factor r = –3 and MN = 9.
5. Find the magnitude and direction of for A(4, 2) and B(–2, –1).
• circle
• center
• chord
• radius
• Identify and use parts of circles.
• Solve problems involving the circumference of a circle.
• diameter
• circumference
• pi ()
Answer: 9
Find Radius and Diameter
Formula for radius
Substitute and simplify.
Since all radii are congruent, RN = RP.
Answer: So, RP = 2.
Find Radius and Diameter
Find Measures in Intersecting Circles
Find Measures in Intersecting Circles
Answer: 27 mm
Since the diameter of FZ = 5.
Since the diameter of , EF = 22.
Segment Addition Postulate
Substitution
is part of .
Simplify.
A. Find C if r = 13 inches.
Answer: 26 or ≈ 81.68 in.
Find Circumference, Diameter, and Radius
Circumference formula
Substitution
B. Find C if d = 6 millimeters.
Answer: 6 or ≈ 18.85 mm
Find Circumference, Diameter, and Radius
Circumference formula
Substitution
C. Find d and r to the nearest hundredth if C = 65.4 feet.
Find Circumference, Diameter, and Radius
Circumference formula
Substitution
Use a calculator.
Divide each side by .
Answer: d ≈ 20.82 ft; r ≈ 10.41 ft
Find Circumference, Diameter, and Radius
Radius formula
Use a calculator.
Use Other Figures to Find Circumference
Use Other Figures to Find Circumference
The radius of the circle is the same length as either leg of the triangle. The legs of the triangle have equal length. Call the length x.
Pythagorean Theorem
Substitution
Divide each side by 2.
Simplify.
Take the square root of each side.
Answer: 6
Use Other Figures to Find Circumference
So the radius of the circle is 3.
Circumference formula
Substitution