0
Remember the circle eq'n ;-
C = 2 pi r
Hence
When r = 21
C = 2* 3.14 * 21 =
C = 131.88 units.
Still curious? Ask our experts.
Chat with our AI personalities
ReneChange my mind. I dare you.
Chat with Rene
TaigaEvery great hero faces trials, and you—yes, YOU—are no exception!
Chat with Taiga
RafaThere's no fun in playing it safe. Why not try something a little unhinged?
Chat with Rafa
Add your answer:
Earn +20 ptsQ: What is the circumference of a circle if r equals 21?
Write your answer...
Submit
Still have questions?
Continue Learning about Math & Arithmetic
What is the circumference of a r equals 2 cm circle?
Circumference = 2*pi*r = 12.566 cm (approx)
What is the circumference of a circle with a diameter of 58.4 cm?
the circumference of a circle equals 2x(pi)x(r) r=d/2 r=58.4/2=29.2 the answer =2x(pi)x29.2 =58.4(pi)
What is the approximate circumference of circle r?
Circumference of a circle with radius 'r' = 2(PI)(r) ~ 6.28(r)
Is c equals 2πr the same as c equals πr squared?
No. C = 2*pi*r is the equation representing the circumference of a circle. The area of a circle is equal to pi*(r^2).
What does the circumference of a circle?
You mean what Is the circumference of a circle? pi*(r)squared.
Trending Questions
What is a four-sided polygon with no congruent sides?
What shape has 3 equal sides but no parallel sides?
What does equilateral angle mean?
How do you recheck division problems?
How do you make a vegetable necklace pizzazz answer?
What are the possible outcomes that appear on the face of three dice when rolled?
What is 8.134 in scientific notation?
What two numbers multiplied together make 21?
What is the perimeter of a rectangle with one side 5cm if it has an area of 35cm2?
How do you solve x plus 4 equals 8?
What is 865 divided by 65?
Does a parallelogram have a radius?
How many 90 degree days per year in Atlant GA?
Five a rational number true or false?
What are equivalent shapes?
Is 500 an even number?
What is the expanded form for 20632?
What is 150 divided by 11 with remainder?
What is the scientific notation for 42000?
5 pounds is equal to how many oz?
Copyright ©2025 Infospace Holdings LLC, A System1 Company. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Answers.