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1. October 4, 2012
Drawing triangles and other shapes
1. Drawing triangles
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2. Explanation October 4, 2012
Sometimes you are asked to make an C
20cm
accurate drawing of a sketch such as this…
40º
You need a pencil, a protractor and a ruler. A 15cm B
The anglepointanglepoint Bthefrom youryourthrough lies
Usingthe 40º40º is mark thethis line40º angle, it point C.
Mark and label20cmand lineusing pointto this as it the
Label the ofjoining called to C, at and A, ruler.
included label
Draw a line ruler, drawto a , line using ruler. line.
a protractor, Aalong point AC.
your line a
between40º. two lines of which you know the length.
point at the
C
20cm
40º
A 15cm B
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3. Explanation October 4, 2012
Sometimes you are given one side and two R
angles, like this…
35º 28º
Again you need a pencil, a protractor P 12cm Q
and a ruler.
Measure the angle than PQ.
The completed triangle.at Q.
Draw andline QR. 28º PQ.
the label the line
a line longer 35º P.
R
35º 28º
P 12 cm Q
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4. Explanation October 4, 2012
You may be given the length of three sides, but no
angles.
Construct a triangle ABC with AB = 14 cm, AC 9 cm and
BC = 13 cm.
This time you will need a pencil, a ruler and a pair of
compasses.
C
m1
9 c 3 cm
A 14 cm B
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5. Explanation October 4, 2012
You may be given two sides and a non-included Z
angle. That is an angle not between the two
10cm
known sides.
60º
The completedcrosses XY.cm
Where to the with radiusfrom X. is Z.
Measure arclonger thanthe line from Y.
Join Ythe lineangle
Draw an Z.arcXY. 60º 10
a the
line triangle. X 8.6cm Y
Z
10 cm
10
mc
60º
X 8.6 cm Y
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End