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triangle
a three sided closed polygon
A
G B
symbolic notation:∆BAG
acute angle
an angle whose measure is less than 90ᴼ
40ᴼ AWWW… Such a CUTE little angle!
symbolic notation:m∠A = 40ᴼ
A
right angle
an angle whose measure is exactly 90ᴼ
symbolic notation:m∠B = 90ᴼ
B
obtuse angle
an angle whose measure is greater than 90ᴼ
symbolic notation:m∠C = 120ᴼ
C120ᴼ
(obtuse angle)
straight angle
an angle whose measure is exactly 180ᴼ
symbolic notation:m∠ABC = 180ᴼ
BA C
HINT: THERE IS ONLY 1 STRAIGHT ANGLE…(thus a straight angle is different from supplementary angles!!!)
congruent
Two figures, segments, triangles, etc. that have the same size, same shape, same measure
∆PQR ≅ ∆LJK
symbolic notation:≅
C’B’
A’
A
B
C
Example of a Rule for a
Transformation:(x,y)→‘(-y,x)
imagepre-image
collineara set of points that lie on the same line
example:
Points P, Q, & R are collinear. Points X, Y, & Z are noncollinear.
symbolic notation:P, Q, and R,are collinear
symbolic notation:⊥
symbolic notation:∥
no symbolic notation
dilation
a transformation that results in similar figures
AB
Figure A has been dilated by a scale factor of 2 to form Figure B.
Intersecting Lines
• Two lines that cross at a single point.
• Symbolic Notation: none
Polygon
• A closed figure in a plane with at least three straight sides
• Symbolic Notation: none
Regular V. Irregular Polygon
• Regular polygons have all congruent sides and interior angles.
• Irregular polygons do not have all congruent sides and interior angles.
• Symbolic Notation: None
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