Splash Screen. Five-Minute Check (over Chapter 9) NGSSS Then/Now New Vocabulary Key Concept: Special Segments in a Circle Example 1: Identify Segments in a Circle Key Concept: Radius and Diameter Relationships Example 2: Find Radius and Diameter Key Concept: Circle Pairs
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Key Concept: Special Segments in a Circle
Example 1: Identify Segments in a Circle
Key Concept: Radius and Diameter Relationships
Example 2: Find Radius and Diameter
Key Concept: Circle Pairs
Example 3: Find Measures in Intersecting Circles
Key Concept: Circumference
Example 4: Real-World Example: Find Circumference
Example 5: Find Diameter and Radius
Example 6: Standardized Test ExampleLesson Menu
MA.912.G.6.1Determine the center of a given circle. Given three points not on a line, construct the circle that passes through them. Construct tangents to circles. Circumscribe and inscribe circles about and within triangles and regular polygons.
MA.912.G.6.2 Define and identify: circumference, radius, diameter, arc, arc length, chord, secant, tangent and concentric circles.
Also addresses MA.912.G.6.5.NGSSS
CROP CIRCLES A series of crop circles was discovered in Alberta, Canada, on September 4, 1999. The largest of the three circles had a radius of 30 feet. Find its circumference.
Since the radius is 30 feet, and d = 2r, the diameter = 2(30) or 60 feet.
C = dCircumference formula
= (60) Substitution
= 60 Simplify.
≈ 188.50 Use a calculator.
Answer: The circumference of the crop circle is 60 feet or about 188.50 feet.Example 4