GEOMETRY Circle Terminology.

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Circle Terminology GEOMETRY

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Presentation transcript:

GEOMETRY Circle Terminology

Radius (or Radii for plural) Definition: The segment joining the center of a circle to a point on the circle. Formula: 1/2 diameter Example: OA

Diameter Definiton: A chord that passes through the center of a circle. Formula: 2xradius Example: AB

Chord Defintion: A segment joining two points on a circle Example: AB

Central Angle Definition: An angle whose vertex is at the center of a circle. Example: Angle ABC

CIRCUMFERENCE Definition: Circumference is the distance around the circle. Example: find the circumference of this circle…… Circumference= 2 X 4 X 3.14 C= 25.12 cm Formula: Circumference = 2x radius x 2 π (OR pi x diameter) Radius = 4cm

AREA OF CIRCLE FORMULA: PI X RADIUS SQUARED DEFINITION: THE AMOUNT OF SQUARE UNITS INSIDE THE CIRCLE EXAMPLE: RADIUS - 3IN AREA = PI (3.14) X 3squared= 3.14 x 9=28.26sq in FORMULA: PI X RADIUS SQUARED

PRACTICE!!! Write answers on your paper- then we will check in 5 mins 1) RADIUS= 4CM, WHAT IS THE DIAMETER? 2) DIAMETER= 44IN, WHAT IS THE RADIUS? 3) Diameter = 3in, what is circumference? (use 3.14 for pi and use a calc) 4) Diameter= 5cm, what is radius? 5) Diameter 10cm, what is circumference? (use calc)