# ML Aggarwal Solutions Class 10 Mathematics Solutions for Mensuration Exercise 17.2 in Chapter 17 - Mensuration

Question 30 Mensuration Exercise 17.2

The slant height and base diameter of a conical tomb are 25 m and 14 m respectively. Find the cost of white washing its curved surface area at the rate of Rs 210 per 100 m2.

Solution:

The shape of a cone is produced by stacking several triangles and spinning them around an axis. It has a total surface area and a curved surface area because it has a flat base.

Given slant height of conical tomb, l = 25 m

Base diameter, d = 14 m

So radius, r = 14/2 = 7 m

Curved surface area =π rl

= (22/7)×7×25 = 550 m2

Hence the curved surface area of the cone is 550 m2.

Rate of washing its curved surface area per 100 m2 = Rs. 210

So total cost = (550/100)×210 = Rs. 1155

Hence the total cost of washing its curved surface area is Rs. 1155.

Related Questions

Lido

Courses

Teachers

Book a Demo with us

Syllabus

Maths
CBSE
Maths
ICSE
Science
CBSE

Science
ICSE
English
CBSE
English
ICSE
Coding

Terms & Policies

Selina Question Bank

Maths
Physics
Biology

Allied Question Bank

Chemistry
Connect with us on social media!