Classify Angles
an angle between 0 and 90 degrees
acute angle
This tool is used to measure angles.
a protractor
When two or more lines cross each other in a plane, they are called __________.
intersecting lines
Complementary angles add up to be ______.
90º
Supplementary angles add up to be _________.
180º
an angle between 90 and 180 degrees
obtuse angle
Angles are measured in (units) :
Degrees
These are lines in a plane that are always the same distance apart and never intersect.
Parallel lines
Two complementary angles will form a _______ angle.
a right angle
Supplementary angles also form a __________.
a straight line or a line segment
an 90 degree angle
right angle
Two angles that have the same measurement are called __________.
Congruent
These are defined as two lines that meet or intersect each other at right angles (90°).
Perpendicular lines
If angle T and angle V are complementary angles, and the measure of angle T is 40º, what is the measure of angle V?
50º
If angle T and angle V are supplementary angles, and the measure of angle T is 45º, what is the measure of angle V?
135º
a 180 degree angle
straight angle
True / False
Protractors usually have two sets of numbers going in opposite directions.
TRUE
A straight line which just touches the curve at a given point.
A tangent
If angle A and angle B are complementary angles, and the measure of angle A is 20º, what is the measure of angle B?
70º
If angle K and angle L are supplementary angles, and the measure of angle L is 105º, what is the measure of angle K?
75º
An angle with a measure of zero degrees is called:
a zero angle
The history of the mathematical measurement of angles was done by taking measurements of the Sun's shadow against graduations marked on stone tables in this country (known for pyramids).
Egypt
In three-dimensional geometry, ________ are two lines that do not intersect and are not parallel.
Skew lines
If angle M and angle N are complementary angles, and the measure of angle N is 28º, what is the measure of angle B?
62º
If angle E and angle F are supplementary angles, and the measure of angle F is 163º, what is the measure of angle E?
17º