unit 3 Flashcards
A triangle with no equal sides is called a(n) _____ triangle.
scalene
The sum of the measures of the interior angles of a triangle is _____ degrees.
180
A(n) _______ angle of a triangle is equal to the sum of the two remote interior angles.
exterior
A three sided regular polygon is called _______.
an equilateral triangle
A _______ is a four sided polygon.
quadrilateral
A polygon with congruent angles and congruent sides is called a________.
regular polygon
what can be an isosceles triangle
A scalene triangle
If a triangle is a right triangle, then the other two angles must be______.
acute
The sum of the exterior angles of a polygon is always ________ degrees.
360
How many diagonals can be drawn from one vertex of an octagon?
5
The sum of the measures of the interior angles in a polygon is 540 degrees. How many sides does the polygon have?
5
The measures of the angles in a triangle are x, 2x, and 3x. The triangle is
right
The exterior angle measure of a regular polygon is 20 degrees. How many sides does the polygon have?
18
Two lines that do not intersect are parallel. always/sometimes/never
sometimes
Two coplanar lines that are perpendicular to the same line are parallel. always/sometimes/never
always
If two lines are cut by a transversal, the corresponding angles are equal in measure.
sometimes
When two lines are cut by a transversal, if the alternate interior angles are equal in measure, then the lines are parallel.
always
Two lines parallel to the same plane are parallel to each other.
sometimes
Perpendicular lines intersect to form right angles.
always
Two adjacent angles whose exterior sides are opposite rays are complementary.
never
Through a point not on a line, one and only one line can be drawn parallel to the given line.
always
cut into two equal parts
bisect
If two lines are perpendicular, then they form
right angles
If two lines intersect, then the vertical angles formed must be
both equal in measure
All right angles are _____ degrees.
90
A pair of angles whose sum is 90 degrees are called
complementary
Two adjacent, supplementary angles form a
line
The vertex of ∠WON is
O
The measure of an obtuse angle is
greater than 90 and less than 180 degrees
Which of the following angles has a measure that is less than 90 degrees?
acute
An angle is formed by the union of two _________.
rays
An angle with a measure of _______ is formed by two opposite rays.
180°
