Matric Maths - Geometry Acceptable Reasons - Lines (Official Exam Guidelines)

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Here is the link to the Matric Examination Guidelines which contain the proofs and reasons you need to know for Geometry.



In this video we look at the acceptable reasons for Geometry. These are the reasons that the markers will accept when you write your paper 2.

THEOREM STATEMENT
ACCEPTABLE REASON(S)
LINES
The adjacent angles on a straight line are supplementary.
∠s on a str line
If the adjacent angles are supplementary, the outer arms of these angles form a straight line.
adj ∠s supp
The adjacent angles in a revolution add up to 360°.
∠s round a pt OR ∠s in a rev
Vertically opposite angles are equal.
vert opp ∠s =
If AB || CD, then the alternate angles are equal.
alt ∠s; AB || CD
If AB || CD, then the corresponding angles are equal.
corresp ∠s; AB || CD
If AB || CD, then the co-interior angles are supplementary.
co-int ∠s; AB || CD
If the alternate angles between two lines are equal, then the lines are parallel.
alt ∠s =
If the corresponding angles between two lines are equal, then the lines are parallel.
corresp ∠s =
If the cointerior angles between two lines are supplementary, then the lines are parallel.
coint ∠s supp


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