Please Answer this!!! I am Needing it!!!!!!
2007-01-27 18:00:24 · 8 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
diameter = 42
radius = 21
circumference = 2 pi r
= 2 x 3.14 x 21
= 132.8 (approx)
Given he took 5 rounds
= 132.8 x 5
= 659.4 m
2007-01-27 18:09:40 · answer #1 · answered by Anonymous · 0⤊ 0⤋
The circumference of a circle, or the distance around the lagoon, is equal to PI * (RADIUS)^2 where RADIUS is 1/2 Diameter. So the answer is PI * (21^2) * 5 times around the lagoon you get 6927.211801 meters rounded to however many significant digits you need.
2007-01-27 18:10:37 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Circumference of a circle is 2 x pi x radius
the radius is half the diameter 42/2= 21 metres.
So circumference is 42pi.
If he runs around it 5 times, 5 x 42pi = 210 pi
2007-01-27 18:10:27 · answer #3 · answered by Jhsiao 2 · 0⤊ 0⤋
42 m diameter => radius is 21 meter
circumference fo the lagoon = 2 x 3.14159265 x 21 = 132
5 times => 660
2007-01-27 18:37:05 · answer #4 · answered by sm bn 6 · 0⤊ 0⤋
The circumferance of a circle is 2 pi times the radius or pi times the diameter and pi is approx. 3.1416. Mutiply 3.1416 x 42 meters x 5 and you have it. Almost 660 meters
2007-01-27 18:10:01 · answer #5 · answered by GatorGal 4 · 0⤊ 0⤋
diameter is 42m...n hence the radius is 42/2=21m...the distance covered by the jogger in 1 round is the circumference of the lagoon...circumfernce=2*pi*radius ....therefore,distance covered by the jogger in 1 round will be 2*3.14*21=131.88m....hence ,distance covered in 5 rounds will be 131.88*5=659.4m.....
2007-01-27 18:21:33 · answer #6 · answered by Anonymous · 0⤊ 0⤋
Are you familiar with circumference equation, c = 2pi*R=pi*D?
In your case you are supposed to find 5c=5*D*pi.
2007-01-27 18:04:28 · answer #7 · answered by Dmitri B 1 · 0⤊ 0⤋
about 659.4 i think
2007-01-27 18:08:22 · answer #8 · answered by BLEHH 3 · 0⤊ 0⤋