toot3715
15.06.2020 •
Mathematics
A disc has a diameter of 21 cm while a mini disc has a diameter of 14cm. Write the ratio of the mini disc diameter to the disc diameter.
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Ответ:
mini disc diameter:disc diameter
14cm:21cm = 7:10.5 = 3.5:5.25 = 1:1.5
Ответ:
The radius of the circle is 18 cm.
Step-by-step explanation:
The circumference of circle O is 36π cm.
The formula for circumference of circle is
Where, r is the radius of the circle.
Put C=36π, to find the radius of the circle.
Divide both sides by 2π.
Therefore the radius of the circle is 18 cm.