Types of lines
What is a line?
A straight path that extends infinitely in both directions.
An angle that measures less than 90 degrees
acute
What is a line of symmetry?
A line that divides a shape into two identical parts.
If one angle is 30 degrees, what is the missing angle in a pair that adds up to 90 degrees?
60
What is an acute triangle?
all angles less than 90 degrees
What is a ray?
A part of a line that starts at one point and extends infinitely in one direction.
an angle that measures exactly 90 degrees
right angle
How many lines of symmetry does a square have?
4
If two angles share a vertex along a straight line and one of them measures 90 degrees, what is the missing angle?
90
What is a right triangle?
one angle equal to 90
What is a line segment?
A part of a line that has two endpoints
an angle that measure more than 90 degrees
obtuse
Does a circle have lines of symmetry?
yes, infinite
If one angle is 110 degrees, what is the other angle in a straight line?
70
What is a right triangle?
one angle greater than 90
What are parallel lines
Two lines that run the same distance apart and never cross
Can an angle be both acute and obtuse?
no
How many lines of symmetry does a triangle have?
depends on the type of triangle, an equilateral has 3
360
Can a triangle be both acute and obtuse?
no
What is the difference between perpendicular and intersecting lines?
Perpendicular lines have to cross to form 90 degree angles, but intersecting lines can cross at any angle.
What type of angle measures exactly 180 degrees?
straight angle
Can a shape have no lines of symmetry?
yes
What is the sum of the angles in any triangle?
180
can a triangl have a right angle, obtuse angle, and acute angle at the same time?
No. It would add up to more than 180