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CHAPTER 6.5
In this chapter
Pupils should be able to: Solving Geometrical
• solve simple geometrical
problems by using side
and angle properties to
identify equal lengths Problems
or calculate unknown
angles
5.5.1 Finding unknown angles
in triangles
Try and Apply!
Truss Challenge!
Put your engineering skills to the test. See if
you can calculate all the unknown angles in
this roof truss.
We have learnt some properties of the sides and angles of triangles earlier.
To solve geometrical problems, we need to make use of the properties of
triangles.
Equilateral Isosceles Right
Size of each angle = 60*^ The angles opposite the The sum of the two acute
equal sides are equal. angles = 90°
These angles are called the
base angles of the triangle.
s Figure 6.2 Angle properties of triangles
Angles and Their Properties
