parts of a circle & circumference
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Parts of a Circle & Circumference. Textbook page 516 IAN page 120. What is circumference?. The circumference of a circle is the distance around the outside of a circle. Circumference. What is diameter?. Diameter. - PowerPoint PPT PresentationTRANSCRIPT
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Parts of a Circle & Circumference
Textbook page 516IAN page 120
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Circumference
Diameter
The circumference of a circle is the distance around the outside of a circle
The diameter of the circle is the distance from one side to the other passing through the centre of the circle
What is circumference?
What is diameter?
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Radius
Chord
A chord is a line touching the circumference of the circle at two points
The radius is the line connecting the centre of the circle and the circumference
What is a chord?
What is a radius?
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Example 1:Name the circle, diameter, and three radii.
C
A BO
The circle is circle O
AB is the diameter
OA, OB, and OC are radii
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Example 2:Find each missing value to the nearest hundredth. Use 3.14 for pi.
(A)
d = 8 ft; C = ?C = πdC ≈ 3.14 . 8C ≈ 25.14 ft
8 ft
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Example 2:Find each missing value to the nearest hundredth. Use 3.14 for pi.
(B)
r = 3 cm; C = ?C = 2πrC ≈ 2 . 3.14 . 3C ≈ 18.84 cm
3 cm
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Example 2:Find each missing value to the nearest hundredth. Use 3.14 for pi.
(C) C = 37.68 in; d = ? C = πd
37.68 ≈ 3.14 . d37.68 ≈ 3.14 d 3.14 3.1412.00 in ≈ d