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Rayna
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the study that deals with the properties, measurements, and construction of flat figures
geometry


limited portion of a line
line segment

segments whose end points can be made to coincide
equal segments

divides a line into 2 equal parts
midpoint

two points that separate a line into 3 equal parts
trisection point

figure formed by two strait lines drawn by the same point
angle

angles whose sides can been made to coincide
equal angle

a line drawn from vertex that divides an angle in two equal parts
angle bisector

an angle formed by one complete revolution of a line (360)
paragon

an angle whose sides form a strait line threw the vertex
strait angle

angles with the same vertex and a common side between them
adjacent angle

angles formed when two strait lines meet to form equal adjacent angles
right angle

lines that meet to form right angles
perpendicular lines

an angle less than a right angle
acute angle

greater than a right angle and less than a strait angle
obtuse angle

an angle greater than a strait angle, but less than a paragon
reflex angle

angles whose sides are neither parallel nor perpendicular
oblique angles

instrument used to measure
protractor

a figure bounded by 3 st. lines
triangle

line from a vertex to a midpoint to the opposite side
median

a line from a vertex perpendicular to the opposite side
altitude

a triangle having no 2 sides
scalene

a triangle having at least 2 sides equal
isosceles

a figure bounded by strait lines
polygon

ε of the angles of a polygon =
(n2)180

a diagonal from a vertex in a polygon creates how many triangle
2 less triangles than the # of sides

a diagonal from the interior side of a polygon creates how many triangles
one less triangle than the # of sides

polygon both equilateral and equiangular
regular polygon

formula for central angle
theta = 360÷n

