Triangles
How many degrees do the angles in a triangle add up to?
180
How many degrees do the angles of a parallelogram add up to?
360 degrees
What is the name of the angle that is less than 90 degrees but greater than 0 degrees?
Acute angle
How many degrees are in a cirlce?
What is special about parallel lines?
They will never intersect and/or they have the same slope
What kind of triangle can you use the Pythagorean Theorem on?
Right triangle
Are all rectangles considered squares?
No
True or false: Vertical angles are congruent
True
What is the distance from the center of a circle to the edge called?
Radius
What does it mean if two lines are perpendicular?
They intersect to form right angles and/or they have negative reciprocal slopes
A particular triangle has an obtuse angle of 107 degrees and an acute angle of 33 degrees, what type of angle and what degree is the third angle?
Acute & 40 degrees
Which parallelogram has only one set of parallel sides?
Trapezoids
What is the name of the angle that is 180 degrees?
Straight angle
What is the equation for the circumference of a circle?
2*pi*r
What is a bisector?
A line that divides another line in half
What are the two main properties of an isosceles triangle?
1. 2 equal sides
2. 2 equal angles (across from the equal sides)
All squares are ALSO 2 different types of parallelograms. What are they?
Rectangle and Rhombus
Parallel lines cut by a transversal create many different types of angle relationships. Name two relationships that have congruent angles.
1. Corresponding angles
2. Alternate exterior angles
3. Alternate interior angles
What is the area of a circle that has a radius of 5? [keep answer in terms of pi]
25pi
What type of line has a point on one end but continues on forever on the other side?
A ray
1. SSS
2. SAS
3. ASA
4. AAS
5. HL
You will prove that it is a parallelogram by showing it has 2 pairs of opposite sides that are parallel by showing that those opposite sides have equal slopes and that it is a rhombus by showing all sides congruent OR diagonals perpendicular.
Parallel lines cut by a transversal create many different types of angle relationships. Name two relationships that have supplementary angles.
1. Same side interior angles
2. Same side exterior angles
What is the formula to find arc LENGTH?
*Assume the central angle is "x"*
2*pi*r*(x/360)
What is the point called where all medians of a triangle connect?
The centroid