GOMATH

Acute angle

• an angle measuring less than 90 degrees but more than 0 degrees

Angle

• formed by two rays or line segments that have the same endpoint.

Vertex

• a shared endpoint on a shape or angle

Right angle

• an angle measuring exactly 90 degrees

OBTUSE ANGLE

• an angle measuring more than 90 degrees but less than 180 degrees.

Straight angle

• an angle measuring exactly 180 degrees

INTERSECTING LINES

• lines in a plane that cross at exactly one point.

Parallel lines

• lines in a plane that are always the same distance apart and never intersect

Perpendicular lines

• lines in a plane that intersect to form four right angles.

Trapezoid

• a quadrilateral with one pair of parallel sides

Parallelogram

• A quadrilateral two pairs of parallel sides and two pairs of sides of equal length

Rhombus

• A quadrilateral with two pairs of parallel sides and four sides of equal length

Rectangle

• A quadrilateral of two pairs of parallel sides, two pairs of sides of equal length, and four right angles

Square

• A quadrilateral with two pairs of parallel sides, four sides of equal length, and four right angles.

Counterclockwise

• The direction opposite from the way the hands move on a clock.

Degree

• The unit used to measure an angle

Protractor

• A tool for measuring the size of an angle.

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