# 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.

You are viewing an excerpt of this lesson. Subscribing to the subject will give you access to the following:

- NEW:
**Download**the entire term's content in**MS Word**document format (1-year plan only) - The complete lesson note and evaluation questions for this topic
- The complete lessons for the subject and class (First Term, Second Term & Third Term)
- Media-rich, interactive and gamified content
- End-of-lesson objective questions with detailed explanations to force mastery of content
- Simulated termly preparatory examination questions
- Discussion boards on all lessons and subjects
- Guaranteed learning