Circles (7) Flashcards
Area =
Pie r squared
Circumference =
2 pie r or pie d
Arc length is proportional to…
Central angle / 360
Arc length formula
Get proportion and multiply by total circumference
If not given a central angle but instead an inscribed angle…
Double inscribed angle to get central angle
Chord
Any line that connects two points on a circle
Tangent
A line that touches a circle at only one point. Perpendicular to the radius at point of tangency
Any triangle drawn with hypotenous as diameter of the circle and all three points touching the sides of the circle…
Right triangle
When a square is inscribed in a circle, the diamter of the circle…
Equals the length of diagonal of the square.
Opposite angles in ANY quadrilateral inscribed in a circle are always…
Supplementary…180 degrees
Intersecting chords theorem…
Products of 2 line segments created in each chord at point of intersection are equal.
Think logically. Sqrt of 5 must…
Be between 2 and 3
