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Level 79

Geometry


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Square
P=s+s+s+s
Rectangle
A Quadrilateral with 4 sides and 4 right angles.
triangle
P=a+b+c
Circle
in a plane, the set of all points equidistant from a given point
Line
A straight path that goes without end in two directions.
ray
Part of a line that has one end point and goes in one direction without end.
line segment
Part of a line with two end points.
Angle
Two rays with the same end point.
right angle
An angle that is 90 degrees (It makes a square in the corner).
Side
Line segments of a polygon.
vertex
The point where two sides meet. (Shared end points of the line segments of a polygon.)
Quadrilateral
A polygon with 4 sides and 4 angles.
Parallelogram
p=s+s+b+b
Trapezoid
P=s1+s2+b1+b2
Rhombus
a parallelogram with four equal sides and equal opposite angles.
Congruent
A plane figure with the same size and shape.
Symmetry
A plane figure that can be folded along a line so the two parts match.
line of symmetry
The line that divides two matching parts. It can be vertical, horizontal, or diagonal.
perimeter
The distance around a geometric figure.
area
the surface; Length x Width
rectangular prism
A solid shape that has: 6 faces (4 rectangles & 2 squares), 8 vertices (corners), and 12 equal edges.
cube
A solid shape that has: 6 square faces all equal in size, 8 vertices (corners), and 12 equal edges.
sphere
A solid shape that is perfectly round like a ball. No faces, edges, or vertices.
cone
A solid shape with a circular base and a curved surface that come to a point (vertex).
cylinder
A solid shape with one curved surface and two congruent circular bases.
pyramid
A solid shape with a polygon as a base and triangular faces that come to a point (vertex or apex)
volume
measures the amount of space taken up by the object.
face
The flat surface of a 3D shape.
Edge
Where two surfaces join (intersect).
plane
A flat surface.
polygon
a closed figure made by joining line segments where each line segment intersects exactly 2 others
Plane figure
A flat figure that can be closed or not closed.
congruent figures
The SAME SIZE and SAME SHAPE
Symmetrical
When one half is a mirror image of the other half.
length
measurement of the distance between two points
width
Distance across from side to side
Base
the number that is written with an exponent
Height
The shortest distance between the base of a geometric figure and its top.
Intersecting lines
Two or more lines that meet at a common point.
Acute Angle
An angle that measures LESS than 90 degrees.
Obtuse Angle
An angle that measures MORE than 90 degrees
straight angle
An angle that measures 180 degrees
angles
The amount of turning between two lines meeting a common point.
diameter
A straight line passing through the centre of a circle to touch both sides of the circumference.
Circumference
2πr
compass
Instrument used for making circles.
radius
From center to a point on the circle.
Vertical Angles
Angles opposite one another when two lines intersect.
Congruent Angles
Angles with equal measures are..
transversal
A line that intersects two or more lines.
acute triangle
A triangle with three acute angles.
obtuse triangle
A triangle with one obtuse angle.
Right Triangle
A triangle with one right angle.
equilateral triangle
Triangle with a 90° angle
isosceles triangle
Triangle with 2 equal sides and 2 equal angles.
Scalene Triangle
A triangle with no congruent sides
Rectangle
A quadrilateral which is a parallelogram with four right angles.
similar figures
Figures that have the same shape, but not necessarily the same size.