ACT Math and Assessment - Geometry
Here you will learn some English words related to geometry, such as "tangent", "vertex", "ellipse", etc. that will help you ace your ACTs.
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the measure of how steep a line is, found by dividing the change in height by the change in horizontal distance
(geometry) a part of a circle, which is curved
a unit for measuring angles, defined by the angle made when the radius of a circle is laid along its edge
the length of a straight line drawn from the center of a circle to any point on its outer boundary
a straight line from one side of a round object, particularly a circle, passing through the center and joining the other side
the total length of the external boundary of something
(geometry) the length of the external boundary of a curved shape, especially a circle
the measurement of a piece of land or a flat surface
the amount of space that a substance or object takes or the amount of space inside an object
the space between two lines or surfaces that are joined, measured in degrees or radians
an angle measuring exactly 90 degrees
one of a pair of opposite angles made by two intersecting lines, which are always equal
an angle formed between two sides of a polygon that lies inside the shape
an angle that measures between 0 and 90 degrees, which is less than a right angle (90 degrees)
pairs of angles that share a common side and vertex in a polygon or between intersecting lines
(of angle) greater than 90 degrees but less than 180 degrees
a measuring instrument used to measure and draw angles
(of lines or planes) intersecting each other at a 90 degree angle
(geometry) a flat shape consisting of three or more straight sides
(geometry) any flat shape with four straight sides, the opposite sides of which are equal and parallel to each other
characterized by or resembling a tetrahedron, which has four triangular faces
a geometric shape with five angles and five straight sides
a small circle whose center moves around the circumference of a larger circle
a geometric curve formed by the intersection of a plane with two cones, resulting in two symmetrical branches
(geometry) a symmetrical open curve that is similar to the path of an object thrown into the air passes till it falls back to earth
a triangle in which all three interior angles are less than 90 degrees
a type of triangle with all three sides of equal length
a type of triangle that has all three sides of different lengths
describing a triangle with at least two sides of equal length
the longest side of a right-angled triangle, opposite the right angle, and defined as the side opposite the right angle in a right-angled triangle
a three-dimensional geometric shape with two parallel circular bases connected by a curved surface at a right angle to the bases
a three-dimensional geometric shape that has a rectangular base and four triangular faces that meet at a single point called the apex
(geometry) a lack of symmetry or equivalence in shape or size between the two sides or parts of something
a point where two or more lines, edges, or rays meet to form an angle, or the point at which the sides of a polygon intersect
a straight line connecting opposite corners of a flat shape at an angle
(in geometry) describing shapes of the same size and form
the side of a geometric shape, usually the one considered as the bottom, from which the height is measured
a pair of geometric figures, such as lines or planes, that do not meet or intersect, no matter how far they are extended
a line that divides a shape into two congruent parts
a series of numbers in which each term after the first is found by multiplying the previous term by a fixed, non-zero number
the total area that the surface of a three-dimensional object occupies
(of a line) intersecting two or more other lines at different points
one-fourth of a circle, formed by two perpendicular radii and the connecting arc
a straight line that a curve approaches indefinitely but never intersects, characterizing the limiting behavior of the curve
to divide something into two equal parts
a straight line that touches a curve or surface at exactly one point, known as the point of tangency
a straight line segment that connects two points on the edge of a circle
(geometry) to move a shape or figure from one position to another without rotating, resizing, or otherwise altering its shape
