Lines
These lines go on forever in both directions and never meet.
Parallel Lines
What is the name of an angle that measures 35 degrees?
Acute angle
What do you call any shape with 4 sides?
A quadrilateral
A triangle with ALL angles less than 90 degrees is called what?
an ACUTE triangle!
An acute triangle has all acute angles!
Which of these is always a quadrilateral?
A. Pentagon
B. Circle
C. Parallelogram
D. Obtuse triangle
a PARALLELOGRAM!
This has one endpoint (or starting point) and goes on forever in one direction.
A Ray
How many degrees does a straight angle measure?
180! It is half of a circle, which measures 360 degrees!
A square is a rectangle.
True or false?
TRUE!
Four sides. Four right angles. Opposite sides are equal.
BUT a rectangle is not a square! Not ALL sides are equal, only the opposite sides.
A triangle has angles measuring:
30 degrees
90 degrees
67 degrees
What type of triangle is it?
RIGHT Triangle!
30 degrees
90 degrees (it has 1 right triangle!)
67 degrees
What type of lines form a right angle in a square?
Perpendicular Lines
What type of lines form a right angle when they intersect?
Perpendicular Lines
DOUBLE JEOPARDY!!!!
What are the angle names in order from smallest degrees to largest degrees? (There are 4 angles to list)
Acute (less than 90), Right (90), Obtuse (More than 90), Straight (180)
What shape am I?
I am a quadrilateral.
I have one pair of parallel sides.
I have no right angles.
I am a TRAPEZOID!
A triangle has angles measuring
40 degrees
54 degrees
104 degrees
What kind of triangle is it?
an OBTUSE triangle!
40 degrees
54 degrees
104 degrees (It has 1 obtuse angle!)
A rectangle is a square.
True or False
FALSE!
A rectangle does NOT have all equal sides. Opposite sides are equal! (BUT a square IS a rectangle because its opposite sides are equal)
Two lines that intersect, but do NOT form right angles
Intersecting Lines
What is the name of an angle that measures 102 degrees?
Obtuse angle
Daily Double!!!!
What shape am I?
I have all equal sides.
Opposite sides are parallel.
I have no right angles.
I am a RHOMBUS!
DAILY DOUBLE!!!
Mrs. Castro is drawing a right triangle.
She drew a 23 degree angle. What are 2 other angle measurements she can draw to create a right triangle?
90 degrees and ANY number between 1 and 89 (acute angle)!
Remember: You need 1 RIGHT angle and 2 acute angles in a RIGHT triangle.
What kind of triangle am I? My angles measure
103
87
62
Obtuse triangle!
103 (1 obtuse angle)
87
62
This goes on forever and has no endpoints
A line
What is the sum of a right angle and an 18 degree angle?
90 + 18= 108 degrees
How many pairs of parallel sides does a parallelogram have?
A parallelogram is a quadrilateral with opposite sides parallel. (2 pairs!)
An OBTUSE triangle can have 2 obtuse angles.
TRUE or FALSE? You must explain your answer!
FALSE! You can not make a triangle with 2 obtuse angles. They will not form a triangle!
What kind of line of symmetry does a right triangle have?
horizontal, diagonal, or vertical?
Diagonal!