Dos and Don'ts
Marking
Scheme:
Part (a) 10 marks, Part (b) 20 marks, Part(c) 20 marks.
For
starters.

The
attempt for each part of a question is 1/3 of the
marks for that part of the question.

One of the most popular topics examined on leaving cert Ordinary
Level Maths is Trigonometry.
How
to attack a Trigonometry question
Before starting any question on Trigonometry
(a) Ensure
that your calculator is in degree mode, deg should be
on the screen. If deg is not there, press the DRG button
(Sharp) until deg appears on the screen.
(b) Calculators work in degrees, so if the angle is given to
you in degrees and minutes you must tell the calculator
this by using the DMS button. It is best just to work
in degrees.
Many questions are based on the rightangled triangle,
and page 9 of the maths tables.
_{}
The above information
was all that was needed to answer all of the following
Questions (all taken from Paper 2) 1999Q5a, 1998Q5b, 1997Q5b,
1996Q5b, and 1995Q5a
Length
of an arc Area of a sector
The following two
formulae will sort out anything that can be asked in this
area.
Length of an arc _{}
Area of a sector _{}
Questions based on the above formulae were asked in 1999Q5b, 1998Q5a,
and 1994Q5a
Three
Important Formulae
(all on page 9 of
the tables)
(1) Area of a Triangle
= _{}
(2) The Sine Rule
_{}
(3) The Cosine Rule
_{}