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Angles, Lines and Circles
Kinds of angles, angle pairs, lines and the parts of a circle.
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56 cards
- Acute angleTermBetween 0° and 90°
- Right angleTermExactly 90°
- Obtuse angleTermBetween 90° and 180°
- Straight angleTermExactly 180°
- Reflex angleTermBetween 180° and 360°
- Full rotationTerm360°
- Complementary anglesTermAdd up to 90°
- Supplementary anglesTermAdd up to 180°
- Complement of 30°Term60°
- Supplement of 110°Term70°
- Vertical anglesTermOpposite angles made by two crossing lines; they are equal
- Adjacent anglesTermShare a vertex and a side, with no overlap
- Linear pairTermTwo adjacent angles that form a straight line; add up to 180°
- Corresponding anglesTermAngles in matching positions at two different crossings of a transversal
- Alternate interior anglesTermAngles inside the two lines on opposite sides of the transversal
- Alternate exterior anglesTermAngles outside the two lines on opposite sides of the transversal
- Same-side interior anglesTermAngles inside the two lines on the same side of the transversal
- Vertex of an angleTermThe point where the two rays meet
- Angle bisectorTermA ray that splits an angle into two equal angles
- ProtractorTermA tool for measuring angles in degrees
- LineTermA straight path that goes on forever in both directions
- Line segmentTermA piece of a line between two endpoints
- RayTermA part of a line with one endpoint, going on forever one way
- Collinear pointsTermPoints that lie on the same line
- CoplanarTermLying in the same flat plane
- Parallel linesTermLines in a plane that never meet
- Perpendicular linesTermLines that meet at 90°
- Skew linesTermLines in 3D that do not meet and are not parallel
- MidpointTermThe point exactly halfway along a segment
- Perpendicular bisectorTermA line that cuts a segment in half at a right angle
- TransversalTermA line that crosses two or more lines
- PlaneTermA flat surface that extends forever in every direction
- Center of a circleTermThe point equally far from every point on the circle
- RadiusTermA segment from the center to the circle
- DiameterTermA chord through the center; the longest chord
- ChordTermA segment joining two points on a circle
- SecantTermA line that cuts through a circle at two points
- TangentTermA line that touches a circle at one point
- ArcTermA piece of the circle's outline
- Minor arcTermAn arc smaller than a semicircle
- Major arcTermAn arc larger than a semicircle
- SemicircleTermHalf a circle; an arc of 180°
- SectorTermA region bounded by two radii and an arc
- Segment of a circleTermA region bounded by a chord and an arc
- Central angleTermAn angle with its vertex at the center of a circle
- Inscribed angleTermAn angle with its vertex on the circle
- Concentric circlesTermCircles that share the same center
- Congruent circlesTermCircles with equal radii
- Degrees in a circleTerm360
- Radians in a full circleTerm2π
- Degrees in one radianTermAbout 57.3°
- Convert 180° to radiansTermπ radians
- Convert 90° to radiansTermπ/2
- Convert 60° to radiansTermπ/3
- Convert π/4 to degreesTerm45°
- Convert π/6 to degreesTerm30°
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