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CONSTRUCTION
CONTENT
- Construction of Special Angles (Revision)
- Construction of Triangles: (i) Two Sides and an Included Angle (ii) Two Angles and a Side between Them (ii) Three Sides
- Bisecting Angles: Bisecting Angle 90, 60 and any Given Angles
Construction of Special Angles (Revision)
A compass, a pencil, a protractor and a ruler are the needed mathematical instruments for this construction. Angles 30°, 45°, 60°, 90° and their multiples should be thoroughly revised as a prerequisite for the next stage.
Construction of Triangles
Two Sides and an Included Angle
An included angle is an angle holding two sides of the triangle.
Example 1:
A protractor, a pencil and a ruler are the needed mathematical instruments for this construction.
Construct a triangle ABC, such that AB = 4cm, BC = 6cm, ∠B = 62°. Measure AC.
Solution Steps:
1. Make a rough sketch of the triangle.
2. Draw the line BC = 6cm
3.
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ClassHall Instructor
Ezimeruwe Oghenekaro
Halima Ahmadu
Sadiq Barau