Rays, Lines & Points
looking at the review worksheet, list 2 collinear points
C, D, E
Name an obtuse angle
AGE, AGE, BGE... (use angle symbol before 3 letters (ray, vertex, ray)
obtuse angle is greater than 90, less than 180
classify a triangle by its angles: 32, 58, 90
right triangle: right triangles have 1 90-degree angle.
what do you call a 6 sided polygon?
hexagon
#30
similar: same shape, different size
Looking at the worksheet, name 2 parallel lines
BG and AF, each with a line with arrows on either end of it above the letters
name an acute angle
AGB (use the angle symbol before the letters and write them in order: ray, vertex, ray)
an acute angle is less than 90
classify this triangle by its angles: 135, 23, 22
obtuse triangle: obtuse triangles have 1 obtuse angle.
what do you call a quadrilateral with exactly 1 pair of parallel lines?
trapezoid
#33
yes, the dashed line is a line of symmetry, a line that can be drawn through the figure so that each half is a mirror image of the other
name the segment that intersects CD (line symbol above: line w/ double arrow heads)
Find a complement and supplement to a 46 degree angle.
complement: 90 - 46 =44
supplement: 180- 46 =134
Draw an obtuse scalene triangle
obtuse triangles have 1 obtuse angle & scalene triangles have all 3 sides of different lengths
list the characteristics that define a rhombus
2 pairs of parallel sides, has 4 congruent sides
#35
3, drawn through each point through the opposite straight side opposite the point
Measure angle AGD
130
Tell whether the angles are complementary, supplementary, or neither: 115 & 65
supplementary: 180-65 = 115 (supplementary angles add up to 180 degrees)
draw an acute equilateral triangle
an acute triangle has all acute angles, an equilateral triangle had all sides of equal lengths
a square has the characteristics of a rhombus (2 sets of parallel lines, 4 congruent sides) but a rhombus lacks the characteristics that define a square (4 right angles, in addition to the characteristics listed for the rhombus)
#29
a: moss
b: omit
c: sides
d: stem
measure angle DGF
24
tell whether the angles are complementary, supplementary, or neither: 73 & 27
neither: 73 + 27 =100, complementary angles add up to 90 and supplementary angles add up to 180
what is the sum of all the angles in a triangle?
180
answer # 28 on the worksheet
rhombus
#36
rotation--turns a figure about a point (center of rotation)
do both