Geometry Terms 4th grade

an endless straight path with no end points

• ray

• line segment

• angle

• line

an angle that measures more than 90 degrees but less than 180 degrees

• acute angle

• obtuse angle

• right angle

• straight angle

an angle that measures 90 degrees

• obtuse angle

• straight angle

• acute angle

• right angle

a triangle with at least two congruent sides

• scalene triangle

• equilateral triangle

• isosceles triangle

• right triangle

A triangle with three congruent sides

• scalene triangle

• right triangle

• isosceles triangle

• equilateral triangle

a quadrilateral with two pairs of parallel sides

• polygon

• quadrilateral

• rhombus

• parallelogram

A triangle with 3 acute angles

• acute triangle

• right triangle

• obtuse triangle

• straight triangle

line in the same plane that never intersect

• perpendicular lines

• parallel lines

• intersecting lines

• obtuse lines

An angle that is less than 90 degrees

• obtuse angle

• straight angle

• acute angle

• right angle

an angle that measures 180 degrees

• right angle

• obtuse angle

• acute angle

• straight angle