Untitled Flashcards Set

circle

a closed, two-dimensional curved shape

prism

a solid shape with two identical and parallel faces

cylinder

a three-dimensional solid that holds two parallel bases joined by a curved surface, at a fixed distance.

pyramid

a 3D figure built with a base of a polygon and triangular faces all connected together.

cone

A solid 3D object that has a circular base joined to a point by a curved side.

sphere

a 3D geometrical shape, that has all its surface points equidistant from a common point.

cross section

the shape formed when cutting an object parallel to its base with a plane

rotation

the circular movement of an object around a centre

volume

the space occupied within the boundaries of an object in three-dimensional space

surface area

The total area of the surface of a three-dimensional object.

density

the mass of an object divided by its volume.

radius

a line segment extending from the center of a circle or sphere to the circumference or bounding surface.

diameter

a straight line that passes through the center of a circle and divides the circle into two sections/semicircles

parallelogram

a 2D shape whose sides are parallel to each other

diagonal

a line that connects two vertices of a polygon or solid, whose vertices are not on the same edge

median

a line segment in a triangle that joins a vertex to the midpoint of the opposite side

altitude

a line segment in a triangle through the vertex perpendicular to a line containing the side opposite of the vertex

angle bisector

a line that splits an angle into two equal angles

perpendicular bisector

divides a line segment into two equal pieces and intersects the bisected line segment at a right angle

parallel lines

lines the same distance apart that never intersect

congruence

same shape and size

similarity

same shape, corresponding angles are congruent

line segment

a part of line that has endpoints on both sides to represent a distinct start and end

inscribed angle

an angle with a vertex on the circumference of a circle and legs that contain chords of a circle

arc

a smoot curve on a circle that joins two endpoints

radian measure

the measure of an angle that subtends an arc with a length of exactly one radius