Lines
True or False: Lines go on forever in both directions
True
What is a right angle?
An angle that measures exactly 90 degrees/ an angle that forms a perfect square corner
What is a quadrilateral?
a four sided polygon
If a triangle has two angles that each easure 60 degrees, what does the third angle measure?
60 degrees
What do you call a line that goes from the exact center of a circle to the outside edge?
radius
What do you call a pair of lines that run beside each other but will never meet?
parallel
What type of angle measures 80 degrees?
acute
What is another name for diamond?
rhombus
What is a right triangle?
a triangle that has one right angle
If a circle has a radius of 5 inches, what is the diameter?
10 inches
What do you call lines that cross each other, but in no specific way?
intersecting
How many degrees does a straight angle measure?
180 degrees
True or false: a quadrilateral can have 3 sets of parallel lines
false
If you combined all of the angles in a triangle, how much would they add up to?
180 degrees
What do you call a line that goes from one side of a circle to the other side, and crosses through the exact center?
diameter
What type of angle does a pair of perpendicular lines make at the point of intersection?
right angle
What type of angle measures more than 90 degrees?
obtuse
What is a square?
A four sided shape with four equal sides and 4 right angles
What type of triangle has 3 different sides?
scalene
How many degrees does every circle measure?
360 degrees
Why can't a line be perpendicular by itself?
Because in order to form an angle, there need to be 2 lines crossing each other
What type of tool is used to measure angles?
protractor
What makes a shape a parallelogram?
2 sets of parallel lines
Why are there always at least 2 acute angles in a triangle?
Because if you had more than one that was 90 degrees or more, the angles would add up to more than 180 degrees.
If the diameter of a circle is 112 mm, what is the radius?
56 mm