# NCERT Class 7 Mathematics Chapter 4 Expressions using Letter-Numbers Solutions: In-Text and Exercise Questions Explained | SwaVid

Here are the questions and step-by-step solutions from NCERT Class 7 Mathematics textbook, Chapter 4 "Expressions using Letter-Numbers". These questions...

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# Expressions using Letter-Numbers

## Find the gaps before this chapter finds them for you.

## Related chapters

Chapter 4 · Class 7 Mathematics

Here are the questions and step-by-step solutions from NCERT Class 7 Mathematics textbook, Chapter 4 "Expressions using Letter-Numbers". These questions include in-text examples and general exercises from the chapter.

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In-text Questions

Answer: (a) 3a (b) 5a (c) 6a

Exercise Questions

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- A triangle with all sides equal is an equilateral triangle. If each side of the triangle is denoted by the letter 'a', then its perimeter is the sum of the lengths of its three equal sides.
- Perimeter = a + a + a = 3a.
- A regular pentagon has five equal sides. If the length of each side is denoted by 'a', then its perimeter is the sum of the lengths of its five equal sides.
- Perimeter = a + a + a + a + a = 5a.
- A regular hexagon has six equal sides. If the length of each side is denoted by 'a', then its perimeter is the sum of the lengths of its six equal sides.
- Perimeter = a + a + a + a + a + a = 6a.
- NCERT Class 7 Mathematics textbook: Mathematics : Chapter 4: Expressions using Letter-Numbers

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