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GRE Math Flashcards > Circles > Flashcards

Circles Flashcards

1
Q

Circle

A

A shape with all points a distance r from the center.

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2
Q

Center

A

The point in the middle of a circle that is a distance r from all other points.

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3
Q

Radius

A

A line from the center to any point on the circle. Always remains the same length.

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4
Q

Diameter

A

A straight line passing through the center and connecting two points on the circle.

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5
Q

Congruent circles

A

Circles with the same radius.

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6
Q

Chord

A

A straight line going from one point on a circle to another.

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7
Q

Radius

A

A straight line from the center of a circle to any point on the circle.

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8
Q

Diameter

A

Two times the radius

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9
Q

Circumference

A

Distance around the circle, equal to pi times its diameter or pi times 2 times its radius.

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10
Q

Central angle

A

An angle formed by two radii.

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11
Q

Measure of an arc

A

An angle formed by two radii with endpoints at the arc’s endpoints.

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12
Q

Length of an arc

A

The distance along an arc from one endpoint to another.

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13
Q

Area of a circle

A

The area enclosed by a circle.

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14
Q

Sector

A

A region of a circle between two radii.

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15
Q

Area of a sector

A

The area enclosed within a sector of a circle.

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16
Q

Tangent

A

A line that intersects a circle at only one point.

17
Q

Point of tangency

A

The point on a circle that a tangent intersects.

18
Q

Inscribed

A

A shape, typically a polygon, whose vertices lie on the circumference of a circle. If it’s a circle inscribes in another shape, the circumference of the circle touches each side of the outer shape.

19
Q

Circumscribed

A

The outer shape that encloses an inscribed shape.

20
Q

Concentric circles

A

Circles with the same center.

21
Q

Equation for the area of a circle

A

A=pi*r^2

22
Q

Equation for the circumference of a circle

A

A=2pir or pi*d

GRE Math Flashcards (28 decks)

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