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Example: What is line AD?
chord
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radius
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Example: What is twice the radius?
chord
diameter
circumference
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Example: What is the area of a circle whose diameter is 10 cm?
Given: Diameter(d) = 10cm; So, Radius(r) = Diameter/2 = 10/2 = 5cm
Area of a circle: πr2 = π x 52 = π x 25 = 25π sq cm
Given: Diameter(d) = 10cm; So, Radius(r) = Diameter/2 = 10/2 = 5cm
Area of a circle: πr2 = π x 52 = π x 25 = 25π sq cm
Grades:
Example: What is the area of a circle whose radius is 5 cm?
Given: Radius(r) = 5 cm
Area of a circle: πr2 = π x 52 = π x 25 = 25π sq cm
Given: Radius(r) = 5 cm
Area of a circle: πr2 = π x 52 = π x 25 = 25π sq cm
Grades:
Example: What is the area of a circle whose radius is 0.5 cm?
Given: Radius(r) = 0.5 cm
Area of a circle: πr2 = π x 0.52 = π x 0.25 = 0.25π sq cm
Given: Radius(r) = 0.5 cm
Area of a circle: πr2 = π x 0.52 = π x 0.25 = 0.25π sq cm
Grades:
Example: What is the area of a circle whose diameter is 1 cm?
Given: Diameter(d) = 1cm; So, Radius(r) = Diameter/2 = 1/2 = 0.5cm
Area of a circle: πr2 = π x 0.52 = π x 0.25 = 0.25π sq cm
Given: Diameter(d) = 1cm; So, Radius(r) = Diameter/2 = 1/2 = 0.5cm
Area of a circle: πr2 = π x 0.52 = π x 0.25 = 0.25π sq cm
Grades:
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