1 / 19

Exit

C. I. R. C. L. E. S. Basic Class VII Terms. Extra Terms. New Theory. Known Theories. Click on the desired option. Exit. Back. Basic Terms.

anoush
Download Presentation

Exit

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. C I R C L E S

  2. Basic Class VII Terms Extra Terms New Theory Known Theories Click on the desired option Exit

  3. Back Basic Terms A line segment which passes through the centre of a circle and has its end points on the boundary on the circle is called a diameter of the circle. Any straight line drawn from any two end points on the circle A line segment with one end point at the centre of a circle and the other on the boundary of the circle, is called a radius of a circle O

  4. The diameter of a circle divides the circle into two equal parts. Each part is called a semicircle. O

  5. Y X A line segment with its end points lying on the boundary of the circle is known as a chord of the circle. A The part of a circle included between two points on the circle is called an arc of the circle. B If the length of the arc Is less than the length of the arc of the semicircle then the arc is called a minor arc of the circle. If the length of the arc Is more than the length of the arc of the semicircle then the arc is called a major arc of the circle.

  6. Y X The chord AB of this circle, divides the circle into two parts. Each part is known as a segment of the circle. A AXB is a major segment of the circle. B AYB is a minor segment of the circle.

  7. A B C D If all four vertices of a quadrilateral lie on a circle then it is called a cyclic quadrilateral.

  8. Back

  9. Back X Y Extra Terms A secant is a line that intersects a circle in two distinct points. XY is a secant

  10. X Y A line that touches a circle in exactly one point is called a tangent to the circle. R

  11. X B A o Z Degree measure of arc AXB If each endpoint of an arc of a circle is joined to the centre of the circle, the measure of the angle formed at the centre is called the degree measure of the arc. O The region enclosed by the arc AXB and the radii OA and OB is called the sector of the circle. Two arcs which have the same length are known as congruent arcs.

  12. Back

  13. Back Known Theories A B O C All angles in a semicircle are 90 degree angles.

  14. C D B A All angles in the same segment are equal. In this case, angle ACB and ADB are equal. Even angle DBC and DAC are equal. 1. All angles in a major segment are acute angles. And all angles in a minor segment are obtuse.

  15. C A B D Angle ACB is in the major segment, while angle ADB is in the minor segment. Since the quadrilateral formed has all four vertices on the circle, it forms a cyclic quadrilateral. So… angle D + angle B = 180 degrees.

  16. Back

  17. New Theory X O A B C The angle subtended by an arc of a circle at the centre is double the angle subtended by it at any point on the remaining part of the circle. In this diagram, angle AOB is twice that of angle ACB.

  18. Back

  19. Math Project Circles Class VII Rhea Karia

More Related