Math vocabulary 5
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Angles in the same position formed when a third line intersects 2 lines.
Corresponding angles

On an angle or a polygon, the point where 2 sides intersect.
Vertex

A parallelogram with 4 right angles.
Rectangle

A quadrilateral with exactly one pair of parallel sides.
Trapezoid

A closed plane figure formed by 3 or more line segments.
Polygon

A parallelogram with all sides congruent.
Rhombus

A quadrilateral with 2 sets of parallel sides.
Parallelogram

A rectangle with 4 congruent sides.
Square

A triangle with no congruent sides.
Scalene triangle

A triangle with 3 congruent sides.
Equilateral triangle

A triangle with one obtuse angle.
Obtuse triangle

A polygon with congruent sides and angles.
Regular polygon

A triangle with 2 congruent sides.
Isosceles triangle

A pair of opposite congruent angles formed by intersecting lines.
Vertical angles

Angles in the same plane that have a common vertex and a common side.
Adjacent angles.

Lines that lie in different planes They are neither parallel or perpendicular.
Skew lines diagonal

Lines that intersect to form right angles.
Perpendicular lines

Lines that lie in the same plane that do not intersect.
Parallel lineslines

A line that intersects 2 or more lines.
Transversal

The number of square units needed to cover a given surface.
Area

The distance around a circle.
Circumference

The distance around a polygon.
Perimeter

The ratio of the circumference of a circle to the length of its diameter.
Pi
equals 3.14