Maths: Year 9 Term 2: Circle Theorems 0.0 / 5 ? MathematicsCircle TheoremsGCSEEdexcel Created by: Charlotte HerondaleCreated on: 19-12-17 11:49 Arrowhead Theorem The angle subtended (made by 2 straight lines) at the centre is double the angle at the circumference. 1 of 12 Same-Segment Theorem Angles made in the same segment are equal. 2 of 12 Triangle in a Semi-Circle ...makes a 90° angle at the circumference. 3 of 12 Cyclic Quadrilateral Opposite angles in cyclic quadrilateral add up to 180° 4 of 12 Tangent A line that touches the circumference at one point but doesn’t enter 5 of 12 Radius The distance from the centre centre to the circumference 6 of 12 Sector A chunk of the circle made by two radii and an arc 7 of 12 Diameter The distance across the circle running through the centre 8 of 12 Arc A section of the circumference 9 of 12 Chord A line (not the diameter or radius) from one point of the circumference to another 10 of 12 Segment A chunk of the circle made from a chord and arc 11 of 12 Circumference The edge of the circle 12 of 12
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