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Circles Parts of a Circle Area & Circumference

Circles Parts of a Circle Area & Circumference. PARTS OF A CIRCLE. The circumference of a circle is the distance around the outside of a circle. Circumference. Diameter. The diameter of the circle is the distance from one side to the other passing through the centre of the circle.

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Circles Parts of a Circle Area & Circumference

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  1. Circles Parts of a Circle Area & Circumference

  2. PARTS OF A CIRCLE The circumference of a circle is the distance around the outside of a circle Circumference Diameter The diameter of the circle is the distance from one side to the other passing through the centre of the circle

  3. A chord is a line touching the circumference of the circle at two points Chord Radius The radius is the line connecting the centre of the circle and the circumference

  4. A segment is the part of a circle between a chord and an arc Segment A tangent is a straight line which touches a circle at one point only Tangent

  5. Circumference of a Circle • Formula is C = 2r (2 x Pi x Radius) or C = d (Pi x Diameter) • Remember… = 3.14 (approximately)

  6. The circumference of a circle Use π = 3.14 to find the circumference of this circle. C = πd 8 cm = 3.14 × 8 = 25.12 cm

  7. The circumference of a circle 9 m 4 cm 58 cm 23 mm Use π = 3.14 to find the circumference of the following circles: C = πd C = 2πr = 3.14 × 4 = 2 × 3.14 × 9 = 12.56 cm = 56.52 m C = πd C = 2πr = 3.14 × 23 = 2 × 3.14 × 58 = 72.22 mm = 364.24 cm

  8. Area of a Circle • Formula is A = r2 (Pi x Radius Squared) radius Area of a circle = πr2

  9. The circumference of a circle Use π = 3.14 to find the area of this circle. 4 cm A = πr2 = 3.14 × 4 × 4 = 50.24 cm2

  10. The area of a circle 2 cm 10 m 78 cm 23 mm Use π = 3.14 to find the area of the following circles: A = πr2 A = πr2 = 3.14 × 22 = 3.14 × 52 = 12.56 cm2 = 78.5 m2 A = πr2 A = πr2 = 3.14 × 232 = 3.14 × 392 = 1661.06 mm2 = 4775.94 cm2

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