Then you should know that it is not the way to teach maths just to give the answers all the time. This person asked a similar question this morning and was told how to do them - they should now do them themselves.
Have you considered that the poster may not have a caclulator or is trying to get to grips wi the process? Not sure about you, but ma pi times table is extremely rusty!!!
Look it may be blindingly obvious to you how to do these questions but it's not to osman okay? There are some things where you can sit down and see why some things are what they are, the area of a rectangle for example. It's not so obvious why a circle's area is pi x the radius x the radius.
Yes, yes, but how is just giving an answer going to help a person learn? Why not simply ask for the reasoning behind a question rather than ask for the answer?
Well, sorry but I do not agree with you. Giving answers does not help anybody to learn. How can you learn without the basics? Learn how to do a question and the answers will follow.
Why not simply teach that Circumference = 2 x pi x r and area = pi x r x r and leave the pupil to work out the answer themselves?
I helped this person with a number of their problems last night without so much as a murmur of thanks - as did other people.
It is no wonder pupils are not understanding if they are continually being given answers - there has to be a time when the pupil has to be given the basics and then work out the answer for themselves.
You may think maths teachers have no problems - but I assure you they do. Anyway, enough. We disagree and thats all there is to it.