Lines
What is the definition of a Line?
A one-dimensional mark that goes on in both directions forever.
What is an angle?
A measurement between two rays.
What is the definition of Symmetry?
When two or more parts are identical after a flip, slide, or turn.
What is a triangle?
A shape with three sides.
What is a Line Segment?
A part of a line.
What is a Ray?
A line with one endpoint. It starts but does not stop.
What is the name of the angle that is less than 90 degrees?
Acute Angle
Four
Which is true about a Scalene Triangle?
A. It has three sides.
B. It has no equal sides.
C. Both A and C
C. Both A and C
An acute angle means:
A. It is 67 degrees
B. It is 120 degrees
C. It is less than 90 degrees
C. It is less than 90 degrees
What is the term for two lines that cross and form a right angle?
Perpendicular Lines
What is a Right Angle?
An angle that is exactly 90 degrees.
What does "line of symmetry" mean?
"Line of symmetry" means the imaginary line where you could fold an image and have both halves match exactly.
What triangle has ALL three sides that are equal?
Equilateral Triangle
What is the difference between a line and a line segment?
A line has arrows showing it continues on in both directions and a line segment has dots to show that it is only a portion of a line.
What is the name for two lines that never cross?
Parallel Lines
What angle is greater than 90 degrees?
Obtuse Angle
How many lines of symmetry does a goldfish have?
One
What triangle has only TWO sides that are equal?
Isosceles Triangle
How can you determine if a triangle is a Right Triangle?
By measuring to see if any of the angles are 90 degrees.
What is the term for two lines that cross?
How do you determine the type of angle you are measuring?
Measure the angle to see if it is less than 90 degrees, exactly 90 degrees, or greater than 90 degrees.
Only Equilateral Triangles have lines of symmetry.
False
(Explain why)
List the 3 types of triangles in order from least to greatest based on how many equal sides they each have.
Scalene Triangle, Isosceles Triangle, and Equilateral Triangle.
How do you determine if a triangle is an Isosceles Triangle?
By measuring all three sides to see if any of the measurements are equal. Two sides must be equal for it to be an Isosceles Triangle.