Appendix A
Appendix A
Appendix A
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Name Diagram Properties<br />
Scalene<br />
triangle<br />
• No sides are equal.<br />
• All angles are different.<br />
Acute-angled<br />
triangle<br />
• All angles are acute (less than 90°).<br />
Right-angled<br />
triangle<br />
• One angle is a right angle (90°).<br />
Obtuse-angled<br />
triangle<br />
• One angle is an obtuse angle<br />
(greater than 90°).<br />
• The longest side is opposite the<br />
largest angle.<br />
A:07E Constructing Quadrilaterals<br />
Often you can construct a quadrilateral in several different ways.<br />
worked examples<br />
To construct this quadrilateral, use the following steps.<br />
Step 1 Draw a 60° angle with your protractor.<br />
Step 2 Mark off the sides AB (5 cm) and AD (3·2 cm).<br />
Step 3 Draw an 80° angle with its vertex at B.<br />
Step 4 Mark off the side BC (3·8 cm).<br />
Step 5 Join CD.<br />
A<br />
3·2 cm<br />
60°<br />
D<br />
5 cm<br />
C<br />
80°<br />
3·8 cm<br />
B<br />
1 2 3 4 5<br />
C<br />
D D D<br />
60° 60°<br />
80°<br />
A A 5 cm B A<br />
B A<br />
B A<br />
3·2 cm<br />
3·8 cm<br />
D<br />
C<br />
B<br />
26 NEW SIGNPOST MATHEMATICS 8
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