2Circumference is a line whose points are equidistant to the center Circle is a portion of plane or area in a circumference
3THE CIRCUMFERENCEA circumference is a closed flat curved where all its points are equidistant from the fixed centre pointThe flat surface outlined by the circumference is called a circleWay at the bottom, change that like to „is called a circle“.
4Elements of a circumference Diameter. The straight line that goes through the center of the circumference and intersect it at two pointsRadius. It is the segment that connects the center of the circumference to any other pointSecant. It is a straight line that intersects a circumference at two pointsTangent. It is a straight line that crossed the circumference at only the point known as tangent pointArc. It is the fragment of the circumference between any two pointsChord. It is the segment that connects any two points of the circumferenceTangentChordRadiusDiameterDiameter: The straight line that goes through the CENTER of the .....Radius. This is the segment..... CENTERSecant. This is.....Tangent. This is the straight line that crosses the .....Arc. This is the .....Chord. This is the.....SecantArc
5RADIUSThe radius of a circle is the distance from the center of the circle to the outside edge.ESTHER CHANGE ALL THE „CENTRE“ words to „CENTER“
6THE DIAMETERThe diameter of a circle is the longest distance across a circle. (The diameter cuts through the center of the circle. This is what makes it the longest distance.)
7PERIMETER OF A CIRCUMFERENCE The perimeter is the distance around the outer edge.Circumference =where r = the radius of the circle and pi =
8A chord of a circleA chord of a circle is a line segment that connects one point on the edge of the circle with another point on the circle.(The diameter is also a chord: it's just the longest possible chord of a circle)At the bottom: The diameter is also a chord. It is just the longest possible chord of a circle.
9An arc of a circle is a segment of the circumference of the circle.
11ANGLE Two rays that share the same endpoint form an angle. The point where the rays intersect is called the vertex of the angle.The two rays are called the sides of the angle.
12α We usually specify an angle using Greek letters like these α, β, γ We can also specify an angle with the letters of its rects adding the symbol above them : rsrEsther, I think a, b, c is Arabic and not Greek. Isnt it? I dont know but thats what I always thought.αs
13Measuring Angles ACUTE < 90º RIGHT= 90º OBTUSE > 90º FULL= 360º We measure the size of an angle using degrees.ACUTE < 90ºRIGHT= 90ºOBTUSE > 90ºFLAT = 180ºFULL= 360ºCLASIFICATION BYMEASUREMENT
14PAIRS OF ANGLES b a a+b = 90º Complementary Angles: Two angles are called complementary angles if the sum of their degree measurements are equals 90 degrees.baa+b = 90º
15ANGLE BISECTORAn angle bisector is a ray that divides an angle into two equal angles.