web2.0calc
 
+0  
 

a challenge question for anyone to try and answer

0
1220
4
avatar+104 

The circumference of a circle is 78.12 cm. A student was asked to approximate the area of the circle.

incorrectly said the area of the circle is about 972 cm squared. What is the approximate area of the​ circle? Use 3.14 for pi What mistake might the student have​ made?

 

​(Round the final answer to the nearest whole number as needed. Round all intermediate values to the nearest thousandth as​ needed.)

 Feb 28, 2017

2+0 Answers

 #3
avatar+128407 
0

I would approximate the radius as ≈ 13 cm

 

So....the estimated area = pi * (13)^2  =  169 pi   ≈  170 * 3   ≈  510 cm^3

 

The true area  is  pi *(78.12/ [2pi])^2  ≈ 486 cm^2

 

[ Don't see what error the student might have made ]

 

 

cool cool cool

 Feb 28, 2017
 #4
avatar
0

The formula for circumference is 2πr

The formula for area of a circle is 2 times pi times radius squared

I really hope that this helps you. Keep trying. Math IS hard!

 Feb 28, 2017

1 Online Users

Top Users

avatar+128407 CPhill moderator
avatar+118608 Melody moderator
avatar+33614 Alan moderator
avatar+14903 asinus moderator
avatar+9519 MaxWong
avatar+3144 admin administrator
avatar+2440 GingerAle
avatar+1763 tomtom
avatar+1441 bader
avatar+1037 parmen
avatar+1030 blackpanther

Sticky Topics