GEOMETRY

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