Chapter 5
What are the interior angles of a triangle?
the sum of the measures of the interior angles of a triangle sum is 180 degrees
What is a perpendicular bisector
a line, segment, or ray that passes through the midpoint of a segment and is perpendicular to that segment
What is a diagonal?
is a segment that connects any two nonconsecutive vertices within a polygon
What is an enlargement?
A dilation with a scale factor higher than 1
What is a 45-45-90 Triangle?
A right triangle with two acute angles that measure 45 degrees
What are exterior angles of triangle?
is formed by one side of the triangle and the extension of an adjacent side
What are concurrent lines?
when three or more lines intersect at one point
What is a parallelogram
It is a quadrilateral with both sets of opposite sides being parallel
What is a reduction?
A dilation with a scale factor between one and zero
What is a 30-60-90 Triangle?
A right triangle with two acute angles measuring 30 and 60 degrees respectively
What are the remote interior angles?
they are two interior angles of a triangle not adjacent to the exterior angle
What is the point of concurrency?
the point of intersection of concurrent lines
What is a rectangle?
A parallelogram with four right angles
it is the ratio of the length on an image to a corresponding length on the preimage
What is trigonometry?
involves triangle measurement
What are congruent polygons?
all the parts of one polygon are congruent to the corresponding parts
What is the circumcenter of a triangle?
a triangle has three sides so it has three perpendicular bisectors
the point of concurrency of these three lines is called the circumcenter
What is a rhombus?
a parallelogram with all four sides congruent
What is a center of dilation?
The center point from which the dilations are preformed
What is an angle of elevation?
angle formed by a horizontal line and a observer's line of sight to an object above the horizontal line
What are corresponding parts?
They are the matching parts of two congruent polygons: angles and sides
What is a median?
a line segment with endpoints that are a vertex of the triangle and the midpoint of the side opposite of the vertex
What is a sqaure?
parallelogram with all four sides and angles congruent
What are similar triangles?
The angles of two triangles are congruent and the segments are proportional
What is a angle of depression
angle formed by a horizontal line and a observer's line of sight to an object below the horizontal line