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Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class


Transcript

Ex 9.2, 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 Inner circle Radius of inner circle = 19 − 10 = 9 cm Circumference of inner 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

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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.