Points, Lines, and rays
What is a point?
An exact location in a space.
What is an acute angle?
An angle that is open less than a right angle.
What is the sum of a right angle and an acute angle that is 15°?
105°
What is an example of parallel lines you might find in the real world?
Railroad tracks, highways, edges of a book, etc.
Draw an acute angle and measure it.
Must be <90°
What is a line?
A straight path of points that goes on without end in both directions.
What is a vertex?
The point at which two lines, line segments, or rays of an angle intersect.
If two angles are adjacent, and one angle measures 60°, what is the measure of the other angle if they form a straight angle (180°)?
120°
Find a right angle in the classroom.
Books, desks, windows, doors, etc.
Draw intersecting lines.
Must be lines that cross at exactly one point.
What are perpendicular lines?
Lines that intersect to form four right angles.
What is an obtuse angle?
An angle that is open more than a right angle and less than a straight angle.
DAILY DOUBLE
You have a straight angle that is 180°. If one of the adjacent angles measures 110°, what is the measure of the other angle?
70°
What is an everyday object that has an obtuse angle?
An open door, the open iPad tower, a clock, etc.
Draw an angle that measures 135° and classify it.
Obtuse angle
What is a ray?
A part of a line that has one endpoint and goes on without end in one direction.
What is a straight angle?
An angle that forms a straight line.
A circle is divided into three parts. One angle is 130°, another angle measures 180°. What is the measure of the last angle?
50°
Find an example of an acute angle.
A clock at 10:10, a slice of pizza, etc.
Draw two adjacent angles.
Must draw two angles that share a common side and a common vertex.
What are parallel lines?
Lines that never intersect.
What two hints help us identify right angles?
It is L-shaped! or It has a box!
You have two adjacent angles. One measures 95 degrees, and the other measures 85 degrees. What is the total measure of the two angles?
180°
Perpendicular Lines
Draw a line segment.
Must draw a line that includes two endpoints.