vocab1
when parts of a shape remain identical after a flip, slide, or turn
symmetry
sum of angles is 180 degrees
supplementary angles
straight angle
angle that is exactly 180 degrees
angle
two line segments that meet together at a common point
vertex
the corner point of an angle
has three acute angles: each angle measures greater than zero and measures less than 90 degrees
acute triangle
right triangle
has one right angle; it measures exactly 90 degrees
line symmetry
it occurs when one half of an image reflects the other- also known as reflection symmetry.
If you draw a line horizontally or vertically across an image, both sides of the line are identical.
angle that is exactly 90 degrees
right angle
two straight sides of a drawn angle
arms
triangle
special polygon with 3 sides and 3 angles
obtuse triangle
has one obtuse angle: the obtuse angle is greater than 90 degrees but less than 180 degrees
obtuse angle
angle greater than 90 degrees but less than 180 degrees
angle less than 90 degrees
acute angle
Complementary Angle
sum of angles is 90 degrees