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Grade 4 Math Module 4 Lisbon
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Gravity
Terms in this set (37)
acute angle
angle with a measure of less than 90 degrees
acute triangle
triangle with all interior angles measuring less than 90
degrees
adjacent angles
two angles with a common side and a common point
angle
two rays sharing a common endpoint
arc
identifies an angle
complementary angles
two angles with a sum of 90 degrees
diagonal
straight lines joining two opposite corners of a straight-sided shape
equilateral triangle
triangle with three sides of equal length
figure
set of points in the plane
interior angle
the angle inside a shape
intersecting lines
lines that contain at least one point in common
isosceles triangle
triangle with at least two equal sides; figure shows
the mark meaning equal sides
line
straight path with no thickness that extends in both directions without end
line of symmetry
line through a figure that creates two halves that match up exactly
line segment
part of a line connecting two points; has two end points
obtuse angle
angle with a measure greater than 90 degrees but less than 180 degrees
obtuse triangle
triangle with an interior obtuse angle
parallel lines
two lines in a plane that do not intersect
perpendicular lines
two lines that intersect forming a 90° angle
point
a precise location
protractor
instrument used in measuring or sketching angles
ray
a line with a starting point and no end point; goes on forever in one direction
right angle
angle formed by perpendicular lines, measuring 90 degrees
right triangle
triangle that contains one 90° degree angle
scalene triangle
triangle with no sides or angles equal
straight angle
angle that measures 180 degrees
supplementary angles
two angles with a sum of 180 degrees
triangles
three non-collinear points and the three line segments that connect them
vertex
a point where two lines meet, such as in an angle or the corner of a triangle; plural is vertices
vertical angles
any two non-adjacent angles formed by intersecting lines
parallelogram
quadrilateral with two pairs of parallel sides
polygon
closed two-dimensional figure with straight sides
quadrilateral
polygon with four sides
rectangle
quadrilateral with four right angles
rhombus
quadrilateral with all sides of equal length
square
rectangle with all sides of equal length
trapezoid
quadrilateral with at least one pair of parallel sides
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