Question

the ratio of the circumference of two circles of the radii 5 cm and 7 cm is​

Answer 1

Step-by-step explanation:

The ratio of the circumference of the two circles = circumference of circle of radius 5 cm / circumference of circle of radius 7 cm

$2\pi \: {r}^{2} \div 2\pi \: {r }^{2} \\ = 2\pi {5}^{2} \div 2\pi {7}^{2} \\ = 2\pi25 \div 2\pi49 \\ = 25 \div 49$

Therefore, the ratio of the circumference of the two circles = 25:49.

Hope this helps you understand my friend ❤️ ❤️ ❤️

Answer 2

Given - Radii of circles = 5 cm and 7 cm

Find - Ratio of circumference

Solution - Circumference of a circle is given by the formula = 2πr. In the formula, r represents radius.

Taking ratio circumference of circles we get = r1:r2 (As 2π will get cancelled).

Therefore, the ratio of radii of mentioned circles will be the ratio of the circumference of these two circles.

So, the ratio of the circumference of two circles = 5:7