16 terms

acute triangle

a triangle with three acute angles

equilateral triangle

a triangle with all equal sides and angles quadrilateral a polygon with four sides

hexagon

a polygon with six sides

isosceles triangle

a triangle with two sides that are congruent

obtuse triangle

a triangle with one obtuse angle

octagon

a polygon with eight sides right triangle a triangle with one right angle

parallelogram

a polygon with two pairs of parallel sides

pentagon

a polygon with five sides

polygon

a closed plane figure with sides made from straight line segments

quadrilateral

a polygon with four sides

rectangle

a parallelogram with all right angles

rhombus

a parallelogram with all sides the same length

right trapezoid

a trapezoid with one right angle

right triangle

a triangle with one right angle

scalene triangle

a triangle with no sides having the same

square

a parallelogram with all sides the same length and all right angles