1. 1. a polygon with four equal sides and four right angles. Area= a^2
  2. 4. Trigonometric ratio. Formula= p/h
  3. 6. the length of a straight line through the centre of a circle. formula=2r
  4. 8. a quantity obtained by the addition of a group of numbers. Ex 3+7
  5. 9. a point equidistant from the ends of a line or the extremities of a figure. Has a theorem based on it.
  6. 10. a parallelogram with four right angles. Area= lb
  7. 11. An angle less than 90 degrees but more than 0 degrees, all angles of equilateral are of this kind.
  8. 12. a triangle that contains an obtuse interior angle. Ex △ABC in which ∠A= 100degree,∠B= 40degree,∠C=40degree
  9. 13. a continuous portion of a circle of two types minor and major.
  10. 14. a quadrilateral whose opposite sides are parallel and equal. formula of area = bh
  11. 17. the extent of a 2-dimensional surface enclosed within a boundary.Ex 6a^2
  12. 18. being everywhere equidistant and not intersecting. Opposite lines are like this in a parallelogram.
  13. 19. two angles whose sum is a right angle.For example, a 50-degree angle and a 40-degree angle.
  14. 20. A plane figure, area= ∏r^2
  1. 2. elevation above sea level or above the earth's surface.All triangles have three of this.
  2. 3. an area that is in the middle of some larger region. It is found in a circle.
  3. 5. The length of the closed curve of a circle. formula= 2∏r
  4. 7. a four-sided polygon. Ex rectangle
  5. 15. All sides of this triangle are equal. Each angle is 60degree
  6. 16. a line enclosing a plane area. Ex 2(l+b)