3rd Periodic Test Flashcards
a polygon with four sides and four vertices
Quadrilateral
The sum of the measures of the interior angles of a quadrilateral is ______
360
a quadrilateral in which opposite sides are parallel.
parallelogram
A polygon with four sides
Quadrilateral
Two pairs of parallel sides
Parallelogram
- All four angles are equal
- Opposite sides are equal
- A parallelogram with four right sides
Rectangle
Has four equal sides and oblique angles
Rhombus
All four sides and angles are equal
Square
One pair of parallel sides
Trapezoid
Non-parallel sides are equal
Isosceles Trapezoid
No parallel sides
Kite
A round plane figure whose boundary consists of points equidistant from a fixed point.
Circle
the fixed point from which all points on the boundary of the circle are equidistant.
Center
The distance from the center of a circle to the outside.
Radius
The distance across the circle going through the center.
It is twice the length of the radius
Diameter
A line segment that connects any two points on the circumference
Chord
The distance once around the circle.
Circumference
curved portion of a circle’s circumference
Arc
A line that goes through/intersects the circle at two points.
Secant
A straight line that touches the circle at a single point only.
Tangent
angle formed by two radii
central angle
an arc that measures less than 180 degrees. It spans less than half of the circle
Minor Arc
- a special arc that measures exactly 180 degrees.
- It is half of the circle and is formed by a diameter
Semicircle
an arc that measures greater than 180 degrees. It spans more than half of the circle
Major Arc
distance around its boundary or perimeter.
Circumference
A tangent to a circle is _______________ to the radius at the point of tangency.
Perpendicular
Two circles are always ________ to each other
Similar
A secant contains a ______
Chord
A circle is ___ a polygon
Not
Two angles are called _____________ when their measures add to 90 DEGREES.
complementary
Two angles are called _____________ when their measures add up to 180 DEGREES.
supplementary
formula for circumference
2πr or πd
value of pi (π)
3.14
formula for circumference when diameter is given
πd / (3.14)(d)
formula for circumference when radius is given
2πr / 2(3.14)(r)
formula for diameter
c / π
formula for radius
c / 2π
