4th Grade Geometry

Flash Cards for 4th Grade Geometry
STUDY
PLAY
square
4 equal sides. 90 degree angles.
rectangle
quadrilateral. 90 degree angles.
quadrilateral
4-sided polygon
perimeter
distance around a figure
area
number of square units it takes to cover a figure
base
bottom of a figure
right angle
90 degree angle
triangle
3-sided polygon
acute triangle
Type of Triangle when each angle is less than 90 degrees
obtuse triangle
Type of Triangle (angle) when 1 angle greater than 90 degrees
right triangle
Type of Triangle with one 90 degree angle.
isosceles triangle
Type of Triangle with 2 congruent sides.
equilateral triangle
Type of Triangle with 3 congruent sides.
scalene triangle
Type of triangle with no congruent sides
hypotenuse
side opposite the right angle in a right triangle
parallelogram
4-sided quadrilateral. 2 pairs of parallel lines
parallel lines
lines that will never intersect
trapezoid
4-sided quadrilateral. 1 pair of parallel lines
congruent
same size, same shape
rhombus
4 equal-sided polygon
segment
line between two points
polygon
many-sided figure, closed, straight line segment
complementary
two angles whose sum equals 90 degrees
supplementary
two angles whose sum equals 180 degrees
perpendicular lines
A set of lines that intersect at 90 degrees
parallel lines
A set of lines that are equal distance apart and will never intersect no matter how far they are extended; railroad tracks
intersecting lines
lines that cross at an angle that is NOT 90 degrees
line segement
has a definite starting point and definite ending point; a ruler
line
extends in each directions infinitely; space
ray
has a definite starting point and an infinite line; the sun's rays
straight line
has 180 degrees
acute angle
an angle that measures less than 90 degrees
obtuse angle
an angle that measures more than 90 degrees