Dear Student,
Circumference of a circle= $2\pi r$         (where r is the radius of the circle)
Given that circumference is 176 cm, we have to find the radius

Q.13
To find the cost of white-washing a wall we will have to find the area of the wall
Area of rectangle= $length×breadth$
= 60m $×$ 50m
=3000${m}^{2}$
To find the cost of white washing- cost per metre square$×$ area of the wall
= 3000$×$6
= Rs 18,000
In the question it is mentioned as 6 per metre but we have taken it as 6 per metre square because for white washing you have to find out the area

Regards

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