Lines and Angles
Draw a pair of parallel lines. What is special about parallel lines?
Parallel lines are two straight lines that never cross.
How many lines of symmetry does a rectangle have?
A rectangle has 2 lines of symmetry.
Which statement is true about right triangles?
A. Right triangles have three congruent sides.
B. Right triangles have one ninety-degree angle.
C. Right triangles have three acute angles.
B. Right triangles have one ninety-degree angle.
How many sides does a parallelogram have?
4 sides
Name two polygons that have an odd number of sides.
Triangle and Pentagon
In the figure, which lines are parallel?
IK and LN
How many lines of symmetry does a decagon have?
A decagon has 10 lines of symmetry.
Draw a Right Isosceles Triangle. What are the characteristics of this triangle?
This triangle has one right angle and two equal sides.
A square can be a rectangle. Can a rectangle be a square? Why or why not?
No, a rectangle can not be a square because a square has to have 4 congruent sides.
Name a polygon that can NEVER have a pair of parallel sides.
Triangle or Pentagon
Draw perpendicular lines. What do perpendicular lines have?
Perpendicular lines have 90-degree angles.
How many lines of symmetry does a circle have?
Draw an Obtuse Scalene Triangle. What are the characteristics of this triangle?
This triangle has one obtuse angle and no equal sides.
What shape has 4 right angles and 4 congruent sides?
A square has 4 right angles and 4 congruent sides.
Which shape has the most angles?
A. Triangle
B. Square
C. Rhombus
D. Pentagon
D. Pentagon
1. What type of line has one endpoint and extends forever in the other direction?
2. What is part of a line called?
1. Ray
2. Line Segment
Look at the illustrations. Which has a line of symmetry? Does one of the illustrations have more than one line of symmetry?
The lock has one line of symmetry. The film strip has 2 lines of symmetry.
Draw an Acute Isosceles Triangle. What are the characteristics of this triangle?
This triangle has acute angles and two equal sides.
Draw a quadrilateral with two acute angles and two obtuse angles. What is the shape's name?
Rhombus or Parallelogram
Which polygon has the fewest vertices?
A triangle with 3 vertices.
Look at the figure.
1. Which lines are perpendicular?
2. What type of angle is G? What about H?
3. If CD and EF continue, will they cross? What type lines will they be?
1. AB and CD
2. G is obtuse. H is acute.
3. Yes, they will cross. They will be intersecting lines.
Do the following letters have lines of symmetry? If they do, find the lines of symmetry.
Example: A
B, C, E, M, P, Q
B, C, E, and M have lines of symmetry
P and Q do not.
Which type of triangle could have one angle that measures 15 degrees and another angle that measures 60 degrees?
Obtuse Triangle
Draw a square. Name four characteristics of a square.
1. Four equal/congruent sides.
2. Four right angles.
3. Two pairs of parallel sides.
4. Four lines of symmetry.
Which regular polygon has 3 sets of parallel sides?
Hexagon