Expressions using Letter Numbers Class 7 Solutions Ganita Prakash Maths Chapter 4
Expressions using Letter Numbers Class 7 Solutions Ganita Prakash Maths Chapter 4 Figure it Out (Page 84-85) 1. Write formulas for the perimeter of: (a) triangle with all sides equal. (b) a regular pentagon (as we have learnt last year, we use the word ‘regular’ to say that all sidelengths and angle measures are equal) (c) a regular hexagon Ans: (a) Let sidelength of each side of triangle = a So, perimeter of triangle with all sides equal = 3a. (b) Let sidelength of a regular pentagon = a So, perimeter of the regular pentagon = 5a (c) Let sidelength of a regular hexagon = a So, perimeter of the regular hexagon = 6a 2. Munirathna has a 20 m long pipe. However, he wants a longer watering pipe for his garden. He joins another pipe of some length to this one. Give the expression for the combined length of the pipe. Use the letter-number ‘k’ to denote the length in meters of the other pipe. Ans: Let the length of the first pipe = 20 m Let the length of the second pipe = k m Then, Combined l...