Ex 11.3, 15 - Chapter 11 Class 7 Perimeter and Area
Last updated at Dec. 12, 2018 by Teachoo
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
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