You must complete Geometric Construction: Triangle to unlock this Lesson.
ENLARGEMENT AND REDUCTION OF PLANE FIGURES
CONTENT
- Enlargement/Reduction of Plane Figures
- The Radial Method and Method of Length of Side
Enlargement and Reduction of Plane Figures
An object is enlarged when all of its dimensions are changed in the same ratio. Thus, enlargement is also called transformation. Each length of the objects is multiplied by the same number called scale factor to obtain the enlargement.
When the scale factor is less than one, the original objects is reduced.
I.e. Scale Factor = length of enlargement/corresponding length.
Examples of enlargement/reduction of plane shapes include:
ENLARGEMENT OF PLANE FIGURES
Drawing a Triangle Which is Twice the Size of the Original Triangle
Procedure:
- Draw the given triangle ABC
- Draw DB perpendicularly to AB, such that BD=AB
- With center A, and radius AD, draw an arc to meet AB at E
- From E, draw EF parallel to BC, with F on line AC
- Draw lines to join AEF to give the triangle double in size.
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
ClassHall Instructor
Halima Ahmadu
Melvyn Chukwu
Favour nwankwo