Презентация на тему Circle theorems

Circle Theorems Name these Features The distance from the centre to the edge The distance from one side to the other passing through the centre The red line The blue line Tangent Degree Chord Sector Segment Diameter Sphere Concentric Arc The distance from the centre to the edge RADIUS The distance from one side to the other passing through the centre DIAMETER The red line TANGENT is a line that touches the edge of a circle The blue line CHORD any line that across a circle Where can you see i) a segment ii) a sector iii) an arc? Sector Segment An ARC is the name for part of the circumference Tangent-Radius meet at Isosceles triangle formed by two radii Why isosceles? Both radii which means they’re the same length Chord Bisector is a DIAMETER Angles in the same segment are equal a a b b Angles at the centre is twice the angle at the edge 2a a The angles made at the centre of the circle is double the angle made at the edge of the circle from the same two points (two ends of the chord) b c d a Example 1 Example 2