Angle from Secants: Vertex Outside Circle

Explanations 3

• There are some useful formulas to calculate angles in circles, formed by radii, chords, secants, and tangents. Central Angle ======== A central angle is formed by two intersecti…

  By Sungjae Chung

• Blurb/stub article In the following diagram, we want a simple expression for ∠AXB=∠CXD\angle{AXB} = \angle{CXD}∠AXB=∠CXD. Diagram (secants intersect outside circle)

  By Victor Wang

• The picture below consists of two secants: ABABAB and BDBDBD. They intersect outside of the circle, producing ∠ABC\angle{ABC}∠ABC. By this we know that the #degrees in arc ADADA…

  By Vivian Loh