Lines
Choose ALL of the true statements.
1. Perpendicular lines meet at right angles
2. Horizontal lines meet at right angles
3. Perpendicular lines will never meet
4. Parallel lines will never meet
1. and 2.
An angle less than 90o?
Greater than 90o?
Acute angle
Obtuse angle
What are these triangles called:
1. all the sides are the same length
2. only 2 sides are the same length
3. no sides are the same length
1. EQUILATERAL TRIANGLE
2. ISOSCELES TRIANGLE
3. scalene triangle
How many degrees does a quadrilateral add up to?
360o
Lines that intersect to form a right angle are called...
Perpendicular lines
True or False:
Vertical angles are congruent
True
180o
A quadrilateral with two pairs of opposite sides parallel and 4 right angles
Rectangle
What is the formula to find the slope of a line?
m=(y2-y1)/(x2-x1)
Define the angle bisector theorem
An angle bisector divides an angle in half.
How do you prove that 2 triangles are congruent?
(what are the acronyms that are usually the last reason in a proof)
SAS, SSS, ASA, AAS, and HL
What is true of a parallelogram's diagonals?
They bisect each other
In y=5x+23, what is the slope? what is the y-intercept?
slope (m)= 5
y-intercept= 23
What are supplementary angles?
They are angles that together equal the sum of 180o.
How do you prove that 2 triangles are similar?
(what are the acronyms that are usually the last reason in a proof)
AA, SSS, SAS, and AAA
How is a rectangle different from a parallelogram?
A rectangle has 4 right angles.
A rectangle's diagonals are congruent to one another.
What is the number of degrees in a straight line
(straight angle)?
180o
How many degrees are in a right angle?
90o
What does CPCTC stand for?
corresponding parts of congruent triangles are congruent
What is true about the opposite pairs of angles in a parallelogram?
Both pairs of opposite angles are congruent.