Check sibling questions

Ex 11.3, 15 - Find the circumference of the inner and outer circles

Ex 11.3, 15 - Chapter 11 Class 7 Perimeter and Area - Part 2

This video is only available for Teachoo black users

Get live Maths 1-on-1 Classs - Class 6 to 12


Transcript

Ex 11.3, 15 Find the circumference of the inner and the outer circles, shown in the adjoining figure? (Take π = 3.14) Outer circle Radius of outer circle = R = OB = 19 m Circumference of outer circle = 2𝜋R = 2 × 3.14 × 19 = (2 × 314 × 19)/100 = 628/100 × 19 = 11932/100 = 119.32 m Inner circle Radius of inner circle = 19 − 10 = 9 cm Circumference of outer circle = 2𝜋r = 2 × 3.14 × 9 = 2 × 314/100 × 9 = 628/100 × 9 = 5652/100 = 56.52 m ∴ Circumference of outer circle is 119.32 m & Circumference of inner circle is 56.52 m

Ask a doubt
Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.