1. Everything Maths www.everythingmaths.co.za
Grade 11
Geometry
Presented by Sikhumbuzo 201233151
by Siyavula on Jan 22, 2012

2. Guidelines to Geometry
Lines
Angles
Triangles
Quadrilaterals
Circles

3. Line Segments
Any straight distance that starts at one spot and ends at
another.

4. Rays
A chosen section of a line.

5. Line
A straight path that extends without end in opposite
directions.

6. Intersecting lines
Two lines that cross at a point and keep going.

7. Perpendicular lines
Two intersecting lines with all 90 degree
angles

8. Parallel lines
Two lines that are never able to cross as long as
they don't curve.

9. Scalene
A triangle with no equal sides
by itutor on Jul29,2013

10. Isosceles
A triangle with only two equal sides.

11. Equilateral
A triangle with all equal sides and angles.

12. Sum of Internal Angles
The sum of all triangles is 180.
90

13. Quadrilaterals
A shape with four angles and four sides that are all
connected.
by Prateek Ahuja, Working at My life my
rules on Dec 26, 2012

14. Trapezoid
A quadrilateral with one set of parallel lines

15. Parallelogram
A quadrilateral with two sets of parallel sides and
opposite sides are congruent.

16. Rectangle
A shape with four connected sides and opposite sides
are parallel and congruent.

17. Rhombus
A shape with four sides that are all congruent.
SajeelK on Dec 08, 2012
s

18. Square
A shape with all sides congruent and opposite sides
parallel.

19. Chord
A line going through a circle.

20. Diameter
The distance across a circle.
5cm

21. Arc
A piece of the outside edge of a circle

22. Radius
Half of the diameter.

23. Other polygons
Hexagon
Octagon
Regular Polygon
Wendy Mendoza

24. Hexagon
A shape with six equal sides.

25. Octagon
A shape with eight equal sides.

26. Using the Third Angle Thm.
22 87 180
109 180
71
m A
m A
m A
+ + < =
+ < =
< =
4 15 71
4 56
14
m D m A
x
x
x
< = <
+ =
=
=
Find the value of x.
herbison on Jun 10, 2008

27. A. x = 4.5, y = 2.75
B. x = 2.75, y = 4.5
C. x = 1.8, y = 19
D. x = 4.5, y = 5.5
In the diagram, ΔFHJ  ΔHFG. Find the values of x and y.

28. Everything Maths www.everythingmaths.co.za
Trapezium
A trapezium is a quadrilateral with one pair of opposite sides parallel.

29. Everything Maths www.everythingmaths.co.za
Kite
A kite is a quadrilateral with two pairs of adjacent sides equal.
●One pair of opposite angles are equal (the angles are between unequal sides).
●The diagonal between equal sides bisects the other diagonal.
●The diagonal between equal sides bisects the interior angles.
●The diagonals intersect at 90°.
Michelle Barnhill
Mar 17,
2011

30. Everything Maths www.everythingmaths.co.za
The mid-point theorem
The mid-point theorem states that the line joining the mid-points of two sides of a
triangle is parallel to the third side and equal to half the length of the third side.

31. Reference list
Mark,D.(2010). Basic of Geometry Grade 11 [on line],Available:file:///C:/Users/G
-report –March-2010/Accessed 05 March, 2014
More sections see: www.everythingmaths.co.za
Hargadon, G.(2012).Basic geometry [online]www.geometry.com/2012/09/
Accessed on the 05 March, 2014
http://www.slideshare.net/1conejo/32-theorems-about-perpendicular-lines
Hargadon, G.(2012).Basic geometry [online]www.geometry.com/2012/09/
Accessed on the 05 March, 2014
http://www.slideshare.net/detwilerr/27-prove-angle-pair-relationships-27098638/accesse
on the 05 March, 2014