Circles
An arc that measures less than 180°
Minor arc
ray
A parallelogram with four congruent sides
rhombus
The angle formed by a horizontal line and the line of sight to an object above the horizontal line. We think of this at standing at the base of a mountain looking up.
Angle of elevation
An enlargement or reduction of a figure
dilation
A triangle with all equal angles(Each angle measures 60°)
Equilateral triangle
A line that intersects a circle at 2 points
Secant line
A corner of an angle or a polygon. Where two rays come together to form an angle or a polygon.
vertex
A quadrilateral with 2 pairs of parallel sides
parallelogram
A trigonometric ratio based on the adjacent side and hypotenuse of a right triangle
cosine
A flip across a line
reflection
A triangle with 1 angle that measures more than 90°
Obtuse triangle
A line that intersects the circle perpendicularly at exactly 1 point.
Tangent line
A polygon with 3 sides
triangle
The non-parallel sides of a trapezoid
legs
The longest side of a right triangle,opposite the 90° angle
hypotenuse
A turn around a point
rotation
A triangle with 2 congruent sides
Isosceles triangle
An angle formed by chords with its vertex on the circle
Inscribed angle
When two lines intersect these congruent angles are formed.
Vertical angles
The side across from the given angle
Opposite side
The resulting figure of a transformation(After)
Image
A triangle with no congruent sides
Scalene triangle
The region of a circle bound by 2 radii and their intercepted arc
sector
Two angles whose sum is 90°
Complementary angles
A triangle with 1 right angle
Right triangle
The beginning figure of a transformation(Before)
preimage
A segment that joins the midpoints of two sides of a triangle.
midsegment
A circle that is tangent to all sides of a polygon
Inscribed circle
An angle that measures exactly 180°
Straight angle
A trigonometric ratio based on the oppositeand adjacent sides of a right triangle
tangent
This means side lengths and angle measures are preserved
Rigid motion
An angle on the outside of a polygon.
Exterior angle
An arc having endpoints on the sides of an inscribed angle
Intercepted arc
Two angles whose sum is 180°
Supplementary angles
A trigonometric ratio based on the opposite side and hypotenuse of a right triangle
Sine
The ratio that determines the enlargement or reduction of a figure.
Scale factor