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A day full of math games & activities. Find one near you.
A day full of math games & activities. Find one near you.
Find the cost of polishing a circular table-top of diameter 1.6 m, if the rate of polishing is ₹ 15/m2. (Take π = 3.14)
Solution:
Diameter of the circular tabletop = 1.6 m
Radius of the circular tabletop = 1.6 m / 2 = 0.8 m
Area of circular tabletop = πr 2
= 3.14 × 0.8 m × 0.8 m
= 2.0096 m2
Since, the cost of 1m2 polishing = ₹ 15
The cost of polishing 2.0096 m2 = ₹ 15 × 2.0096
= ₹ 30.144
Thus, the cost of polishing a circular tabletop is ₹ 30.144.
☛ Check: NCERT Solutions for Class 7 Maths Chapter 11
Video Solution:
Find the cost of polishing a circular table-top of diameter 1.6 m, if the rate of polishing is ₹ 15 m²
Class 7 Maths NCERT Solutions Chapter 11 Exercise 11.3 Question 8
Summary:
The cost of polishing a circular table-top of diameter 1.6 m is ₹ 30.14, if the rate of polishing is ₹ 15 m2.
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