- Basic Constructions
- Some Constructions of Triangles
- Use only ruler and compass while drawing constructions.
- Protractor may be used for drawing non-standard angles.
- Constructions of a triangle given its base, a base angle and the difference of the other two sides.
- Constructions of a triangle given its perimeter and its two base angles.
- A triangle can be constructed if its perimeter and two base angles are given.
- Geometrical construction is the process of drawing a geometrical figure using only two instruments-an ungraduated ruler and a pair of compasses.
- Some specific angles like 15°,30^{o},45^{o},60^{o},75^{o},90°, etc. can be constructed without using protractor.
- A triangle can be constructed if its base, base angle and the sum of the two sides or the difference of the other two sides are given.