GEOMETRY

4. a quantity obtained by the addition of a group of numbers. Ex 3+7
7. an area that is in the middle of some larger region. It is found in a circle.
8. a continuous portion of a circle of two types minor and major.
10. Trigonometric ratio. Formula= p/h
11. the extent of a 2-dimensional surface enclosed within a boundary.Ex 6a^2
12. All sides of this triangle are equal. Each angle is 60degree
14. A plane figure, area= ∏r^2
15. a line enclosing a plane area. Ex 2(l+b)
16. being everywhere equidistant and not intersecting. Opposite lines are like this in a parallelogram.
18. The length of the closed curve of a circle. formula= 2∏r

1. a triangle that contains an obtuse interior angle. Ex △ABC in which ∠A= 100degree,∠B= 40degree,∠C=40degree
2. a four-sided polygon. Ex rectangle
3. the length of a straight line through the centre of a circle. formula=2r
5. a parallelogram with four right angles. Area= lb
6. a point equidistant from the ends of a line or the extremities of a figure. Has a theorem based on it.
8. An angle less than 90 degrees but more than 0 degrees, all angles of equilateral are of this kind.
9. a quadrilateral whose opposite sides are parallel and equal. formula of area = bh
13. elevation above sea level or above the earth's surface.All triangles have three of this.
17. a polygon with four equal sides and four right angles. Area= a^2