Recent content by grace77

Question : https://www.physicsforums.com/attachments/71328 My question is how did the 2a and 2b come from?? Equations: Area of trapezoid =(a+b/2)(h) Attempt: I know that the area of a trapezoid is (a+b/2)(h) However why is there now a 2a and 2b in its place? Could it be related to the 2s...

Can anyone explain this to me? What does if mean that the area may sometimes be negative but that the area must be positive??

The question: This is the solution that was given by my teacher Attempt: I understand how the work is done until the 3-4 line. Where did the 1-cos2x disappear to in the 4th line? I know you can use the outside inside method but try as I might, I can't seem to understand how the final...

The base and height would be double due to the ratio right? Therefore the area would be 1/2(2b x2h)

For example: if it was given that two right triangles are similar triangles and that the hypotenuse of one is twice as long than the other how would you find the area of the triangle with the twice as long hypotenuse given the area of the other? Similar right triangles means they are the same...

Thank you I understand it now

Ok I am not sure what equation to use in this though.

Yes I think I put a negative 1/2 should be a positive

Problem statement Find dy/dx Revelant equations None Attempt at a solution This is what I got to so far but now I'm stuck... Any hints?

That there are no breaks or holes

Maybe someone could elaborate on this for me? Thanks

Never mind I think I understand it now. I think I was just confused by the previous picture leading up to the answer.

Problem statement My question is for number 27. Revelant equation None Attempt at a solution I'm not sure where to start. This is my teachers answer. I understand how the slope is 1 for x greater than -1 and that it is -2 at x greater than -1 and that there is a point at (0,-1) but I...

Thank you. You have been a great help!

Is there a guide where I can find all of these notations?