Maths Perimeter and Area part 18 (Questions 2: Conversion of Units) CBSE Class 7 Mathematics VII

TL;DR

This video lesson explains how to find the length of wire required for wrapping a circular pipe and the leftover length when wrapping a square. It also demonstrates how to find the area of a shaded region and the area of a quadrilateral.

Transcript

hello friends this video on perimeter and area but 18 is brought to you by example calm no more pure Brahmin Sam question number three plug adapt a cord around the circular pipe of radius four centimeters so this is a circular pipe on which a wire was wrapped so this is the wire and cut off the length required of the cordon so whatever length was r... Read More

Key Insights

• 🎁 The length of wire required to wrap a circular pipe is equal to the pipe's circumference.
• 🛜 Wrapping the wire around a square of smaller perimeter will result in leftover wire.
• ❎ To find the area of a shaded region, subtract the sum of the areas of triangles within a square from the square's total area.
• 🪜 The area of a quadrilateral can be calculated by adding the areas of the two triangles it consists of.
• ❓ Understanding concepts of perimeter and area helps solve mathematical problems and create diagrams easily.
• 🥶 The video Lesson is part of a platform called ExamFee that offers free quality education on various subjects.
• 🏛️ The platform provides video lessons, question-solving, reference notes, and online tests for classes 6 to 12.

Questions & Answers

Q: How do you calculate the length of wire required to wrap a circular pipe?

The length required is equal to the circumference of the pipe, which can be calculated using the formula 2 * π * r (where r is the radius).

Q: What is the formula for finding the perimeter of a square?

The perimeter of a square is calculated by multiplying the length of one side by four. In this case, the length of each side is given as 4 cm.

Q: How do you find the area of a shaded region in a square?

To find the shaded region's area, subtract the sum of the areas of the three triangles inside the square from the total area of the square.

Q: How do you find the area of a quadrilateral?

The area of a quadrilateral can be found by adding the areas of the two triangles that make up the quadrilateral.

Summary & Key Takeaways

• The video discusses how to calculate the length of wire needed to wrap a circular pipe and the remaining length after wrapping a square.

• It explains how to find the area of a shaded region by subtracting the sum of areas of three triangles from the total area of a square.

• The lesson concludes by teaching how to find the area of a quadrilateral using the formula for triangle area and adding the areas of two triangles.