This video shows how to find the dimensions of a rectangle with largest area that can be inscribed in a circle of radius r.
Пікірлер: 58
@cesium88573 жыл бұрын
your accent helps me pay attention i have no idea why
@ethandoest94264 жыл бұрын
This video is going to save my final grade!! This solution makes sense now!!
@crowsmathclass4 жыл бұрын
Glad it helped. Good luck in your class.
@幻彩小羽毛4 жыл бұрын
I have a homework question with the exact same same question lol, this was really helpful
@gartyqam3 жыл бұрын
calculus early transcendentals section 8th edition 4.7 question #25
@Maya-xs9xn2 жыл бұрын
@@gartyqam It's a very common Calculus book for college.
@kainime73614 жыл бұрын
Sir I am new to your channel and your explanation amazing it is clear as a crystal of water
@oliviawoloshyn58242 жыл бұрын
Love your voice and this explanation is really easy to follow big thumbs up
@crowsmathclass2 жыл бұрын
Thank you. Glad it helped.
@Waltu02 жыл бұрын
Shouldn't the second term for the derivative of the area be -4x^2/sqrt(r^2-x^2) instead of -4x/sqrt(r^2-x^2)? -x*4x= -4x^2.
@Kakashi7132 жыл бұрын
He did input it there unless I'm missing something? His answer is right.
@rezanhammo32249 ай бұрын
Midterm exam tomorrow, I really appreciate this video
@crowsmathclass9 ай бұрын
Good luck on your exam.
@nam3go3sh3r35 жыл бұрын
Very helpful, thank you!
@crowsmathclass5 жыл бұрын
You’re welcome. Glad it helped.
@bas5rocker3115 жыл бұрын
Thankyou sir!. This was pretty helpful.
@crowsmathclass5 жыл бұрын
You’re welcome. Glad it helped.
@lafhee6 ай бұрын
I LOVE YOUR ACCENT
@crowsmathclass6 ай бұрын
Thank you.
@Maya-xs9xn2 жыл бұрын
Thank you, it really help me understand the problem.
@crowsmathclass2 жыл бұрын
You’re welcome. Glad it helped.
@adamvaught6611 Жыл бұрын
How did the r disappear at the end? Shouldn’t it be r-r/2^1/2?
@ramimazaoui10 ай бұрын
it's like 1-1/2 = 1/2
@jfig76826 ай бұрын
so are we solving for 2x at the end rather than singular x or y?? i was bit confused.
@crowsmathclass6 ай бұрын
x
@laurensalino5 ай бұрын
Super super helpful
@crowsmathclass5 ай бұрын
Glad it helped.
@eduardobarragan17684 жыл бұрын
How would you find the radius of the entire circle?
@Somm_RJ4 жыл бұрын
The radius is a variable. Hypothetically, you can plug any number to it.
@RahooMohammadi-cz8es14 күн бұрын
Can you please help me So i was thinking what if the tye rectangle has a length of 11 cm and width of 6 cm. How do we solve that ??
@Fingerlickinggoood7 күн бұрын
just input the numbers into x and y I think
@maheralabbar1899 ай бұрын
I have a question. Why can’t the area just be xy. Like would it still work. I tried it with radius 4 and I am getting 8 as my area. I don’t get why it has to be (2x) (2y) is there something else to do instead of splitting it into fourths
@crowsmathclass9 ай бұрын
Because center of circle is at the origin.
@maheralabbar1899 ай бұрын
@@crowsmathclass so is it necessary to split it up. My teacher taught us to have the area as xy
@crowsmathclass9 ай бұрын
Yes. Because we center at origin.
@maheralabbar1899 ай бұрын
@@crowsmathclass is there a situation where we can just use A= xy without 2x 2y Like how would we know if it is centered and not centered
@invinceble58824 жыл бұрын
i love your accent
@crowsmathclass4 жыл бұрын
Thank you.
@faithfury23974 жыл бұрын
Hi! i have a question, why r^2 is a constant for this example? i saw time rates with the radius getting derived at, isn't it the same with optimization?
@crowsmathclass4 жыл бұрын
We are looking for the dimensions of the rectangle. r is a constant in this problem. So we are looking for x and y.
@Somm_RJ4 жыл бұрын
Why would you need to do all that? A square is a rectangle. You just have to draw a line (radius) from the center, let's call this A. Then, another line (radius) at 90° of the first line, Let's call this B. Now, you already have 2 sides of a triangle, just calculate the hypothenus using Pythagorean Theorem using the 2 sides above, sqrt(A^2+B^2). Because the 2 sides (A and B) are equal, same as the length of the radius (r), you can simplify this by doing sqrt(2r^2). Or you can alternatively, you can use the sine function, r/sin 45°, since the resulting triangle would be an isosceles triangle and you have a given 90° on 1 angle. The result would be 1 side of the rectangle. Since it is a square, then you just multiply it by itself. In simplest form, it would look like this, Area=sqrt(2r^2)^2 Alternatively, Area=(r/sin 45°)^2
@qalbabbas24963 жыл бұрын
You should find second derivative and find Local maximum and minimum for area,which can give surety for maximum area
@natalie-rg9xm4 жыл бұрын
Thanks man. nice voice
@crowsmathclass4 жыл бұрын
You’re welcome. Thank you for the comment.
@qalbabbas24963 жыл бұрын
How can you say that area is maximum
@beefylilun178 Жыл бұрын
As proof, use the 1st or 2nd derivative test. I think it will show you that that is indeed the maximum area
@francescovellani20574 жыл бұрын
Thank u so much
@crowsmathclass4 жыл бұрын
You're welcome. Glad it helped.
@deadlysummer80714 жыл бұрын
Thank you sir
@crowsmathclass4 жыл бұрын
You’re welcome.
@pmat27573 жыл бұрын
My god thank u so much
@crowsmathclass3 жыл бұрын
You’re welcome.
@victorazariah90385 жыл бұрын
👍
@Anton-lv9fw2 жыл бұрын
u should go faster
@kainime73614 жыл бұрын
Sir I am new to your channel and your explanation amazing it is clear as a crystal of water