Area And Perimeter
Overview
Perimeter is the distance all the way around the edge of a shape, and area is the amount of flat space it covers. Together they answer everyday questions: how much fencing a field needs, how much paint covers a wall, how much carpet fits a room. Once you know a handful of formulas, the four most common straight-sided shapes become quick and reliable.
In this lesson you will calculate the perimeter and area of rectangles, triangles, parallelograms and trapeziums. The formulas are short, but each one hides a subtlety about which length to use. The single most important idea is that area always uses the perpendicular height, never a slanted side, and this lesson makes that habit stick.
Objectives
- Carry out calculations involving the perimeter and area of a rectangle, triangle, parallelogram and trapezium.
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Mind map
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Flashcards
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Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Area And Perimeter. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- A rectangle is 12 cm long and 5 cm wide. What is its area? A. 17 cm^2 B. 34 cm^2 C. 60 cm^2 D. 120 cm^2 Answer: C
- A rectangle is 12 cm long and 5 cm wide. What is its perimeter? A. 17 cm B. 34 cm C. 60 cm D. 120 cm Answer: B
- A triangle has base 8 cm and perpendicular height 5 cm. What is its area? A. 13 cm^2 B. 20 cm^2 C. 40 cm^2 D. 80 cm^2 Answer: B
- A parallelogram has base 7 cm and perpendicular height 4 cm. What is its area? A. 11 cm^2 B. 14 cm^2 C. 22 cm^2 D. 28 cm^2 Answer: D
- A trapezium has parallel sides 6 cm and 10 cm and height 4 cm. What is its area? A. 20 cm^2 B. 32 cm^2 C. 40 cm^2 D. 64 cm^2 Answer: B
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