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A circle has a radius of 3 feet. What is the circumference of a bigger circle if the scale factor of the smaller to bigger is 4:7?

A circle has a radius of 3 feet What is the circumference of a bigger circle if the scale factor of the smaller to bigger is 47 class=

Respuesta :

big/small=4/7

r1/r2=4/7 where  r1, r2 are radius of a big and small circles respectively

r1/3=4/7

r1=12/7

circumference of a big circle is2πr1=2π*12/7=24π/7 cm

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