Introduction to Geometry and Angles
Using the figure on page 500 of your textbook, name two rays, two lines, and two line segments.
What is the difference between parallel, intersecting, and perpendicular lines?
What are ray CA and ray AB (or ray AE), line AB and line CF (or line EA), and segment BC and segment CA (or segment AD)?
What is parallel lines go in the same direction and will never touch, perpendicular lines intersect forming right angles, and intersecting lines intersect but form acute and obtuse angles?
Find the value of x and then classify the triangle by its angles. Look at page 502 in your textbook and look at the triangle under the example.
What are x=100 degrees and it's an obtuse triangle?
Look at page 502 Example for 9.5. Classify the shape of letter a in as many ways as possible.
What are a parallelogram, a rectangle, a rhombus, and a square?
Look at page 503 of your book under 9.6 Example a. Classify the polygon and tell whether it is regular.
What is a pentagon and regular?
What are angles D and X, angles E and Y, angles F and Z, sides DE and XY, sides EF and YZ, and sides FD and ZX?
Use a protractor to draw angle ABC that is 13 degrees.
What is the drawing on their white board (check their whiteboards)?
Find the value of x and then classify the triangle by its angles and its sides. Look at page 502 in your textbook and look at number 27.
What are x=45 degrees and a right isosceles triangle?
Look at page 503 and classify the figure in #31 in as many ways as possible.
What are parallelogram and rhombus?
Look at page 503 of your book under 9.6 Example b. Classify the polygon and tell whether it is regular.
What is a hexagon and not regular?
Look at page 504 of your textbook at #43. Tell whether the triangles are similar or congruent. List the corresponding parts (angles and sides).
What is congruent and angles C and F, angles D and G, angles E and H, sides CD and FG, sides DE and GH, and sides CE and FH?
Use a protractor to draw angle ABC that is 90 degrees and angle ABC that is 127 degrees.
What are the drawings on their white board (check their whiteboards)?
Find the value of x and then classify the triangle by its angles and its sides. Look at page 502 in your textbook and look at number 28.
What are x=60 degrees and it's an acute equilateral triangle?
Look at page 503 and classify the figure in #32 in as many ways as possible.
What is just a quadrilateral?
Look at page 503 of your book under 9.6 #35. Classify the polygon and tell whether it is regular.
What is a rectangle and not regular?
Look at page 504 #44. Tell whether the line shown is a line of symmetry.
What is no?
Classify the angle by its measure (acute, obtuse, right, or straight):
20 degrees
140 degrees
What are acute and obtuse angles?
Find the value of x and then classify the triangle by its angles and its sides. Look at page 502 in your textbook and look at number 29.
What are x=50 degrees and it's an obtuse scalene triangle?
Look at page 503 and classify the figure in #33 in as many ways as possible.
What are parallelogram, rhombus, rectangle, and square?
Look at page 503 of your book under 9.6 #36. Classify the polygon and tell whether it is regular.
What is a pentagon and not regular?
Look at page 504 #46. Tell whether the line shown is a line of symmetry.
What is yes?
Classify the angle by its measure (acute, obtuse, right, or straight):
180 degrees
90 degrees
What are straight and right angles?
Tommy has a triangular drawing tool. If the measures of two of the angles of the tool are 30 degrees and 60 degrees, what is the measure of the third angle?
What is 90 degrees?
The measures of the angles of a quadrilateral are 13o degrees, 80 degrees, 45 degrees, and x degrees. Find the value of x.
What is x=105 degrees?
Look at page 503 of your book under 9.6 #37. Classify the polygon and tell whether it is regular.
What is a hexagon and regular?
Look at page 504 #47. How many lines of symmetry does the figure have?
What is 1 line of symmetry?