Question

the ratio of radius of two circles is 4 : 5 find the ratio of their circumferences​

Answer 1

Step-by-step explanation:

Ans to this is 4:5

Ratios of radius is the same as ratio of circunfrence

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Answer 2

Answer:

circumference of circle=2πr

let as suppose radius are two circle is

r¹=4x, r²=5x

then ,

circumference of circle a first circle=2πr

=2×22/7×4x

44/7×4x

circumference of circle a second circle

=2πr

=2×22/7×5x

=44/7×5x

now, to find value of x

then circumference of second circle= circumference of first circle

44/7×5x=44/7×4x

44/7×7/44=4x-5x

1=x

then

first circumference=44/7×4×1

=176/7

second circumference=44/7×5×1

=220/7

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