3. A fez, the cap used by the Turks, is shaped like the frustum of a cone (see Fig.). If its radius on the open side is 10 cm, radius at the upper base is 4 cm and its slant height is 15 cm, find the area of material used for making it.

                                                                   

Answers (1)

The area of material used is given by :

 Area of material   =  Curved surface area of a frustum of cone   +   Area of upper end 

                           =\ \pi \left ( r_1\ +\ r_2 \right )l\ +\ \pi r^2_2

                           =\ \pi \left ( 10\ +\ 4 \right )15\ +\ \pi \times 4^2

                           =\ \frac{226\times 22}{7}

                           =\ 710.28\ cm^2

Preparation Products

JEE Main Rank Booster 2021

This course will help student to be better prepared and study in the right direction for JEE Main..

₹ 13999/- ₹ 9999/-
Buy Now
Rank Booster NEET 2021

This course will help student to be better prepared and study in the right direction for NEET..

₹ 13999/- ₹ 9999/-
Buy Now
Knockout JEE Main April 2021 (Subscription)

An exhaustive E-learning program for the complete preparation of JEE Main..

₹ 6999/- ₹ 5/-
Buy Now
Knockout NEET May 2021

An exhaustive E-learning program for the complete preparation of NEET..

₹ 22999/- ₹ 14999/-
Buy Now
Knockout BITSAT 2020

It is an exhaustive preparation module made exclusively for cracking BITSAT..

₹ 4999/- ₹ 1999/-
Buy Now
Exams
Articles
Questions