Vocab Essentials
A flat space that goes on forever
Parallel lines never touch
Define the following with degree measurements.
Acute, right, obtuse, straight
Acute - less than 90 degrees
right - exactly 90 degrees
obtuse - more than 90 degrees
straight - 180 degrees
Define a quadrilateral
a shape with 4 straight sides and 4 angles
What type of triangle has 1 angle that is between 91 and 179 degrees?
An obtuse triangle.
What is the difference between a line segment and a line?
line segment - has two endpoints
line - has two arrows and goes on forever on both sides
Define perpendicular lines
They come together and form right angles, which are 90 degrees.
Define the following
Reflex angle and full rotation
Reflex angle - greater than 180 and less than 360 degrees
full rotation - 360 degrees exactly
Name 4 types of quadrilaterals
rhombus, kite, rectangle, square, trapezoid, parallelogram
What type of triangle has 1 90 degree angle?
A right triangle.
What is a vertex?
The point where two rays come together to form an angle.
How many lines of symmetry are in a rectangle
2
Define angle and vertex.
Also - what device is used to measure angles?
angle - two rays come together at an endpoint
vertex - the endpoint where two rays come together to form an angle
A protractor is used to measure angles.
What is the difference between a trapezoid and a parallelogram?
trapezoid - 1 set of parallel lines
parallelogram - 2 sets of parallel lines
Which triangle has all equal sides?
Equilateral triangle
A shape that has all straight sides
How many lines of symmetry are in a circle?
Infinite - going on forever
angles that come together to form 90 degree angle
What two shapes' qualities come together to form a square?
rhombus (4 equal sides) and a rectangle (4 right angles)
What type of triangle has 2 equal sides?
Isosceles Triangle
How many sides for the following shapes?
Pentagon?
Hexagon?
Octagon?
Pentagon - 5 sides
Hexagon - 6 sides
Octagon - 8 sides
When a shape has all equal sides, the number of sides tells you the number of lines of symmetry it has.
Define a supplementary angle
angles that come together to form a straight angle (180 degrees)
What are all the shapes that a square could also be named? (hint - there are a total of 5)
rhombus, rectangle, parallelogram, quadrilateral, polygon
What is the name of a triangle with NO equal sides?