Problems involving maximum and minimum values

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Homework Help Overview

The discussion revolves around a problem involving a rectangle inscribed in a semicircle, focusing on the conditions for maximizing the area and perimeter of the rectangle. The problem presents two specific tasks: demonstrating the ratio of the sides of the rectangle when the area is maximized and exploring the conditions under which the perimeter has a turning value.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the relationship between the dimensions of the rectangle and the semicircle, questioning how to express the width as a function of the length. There are inquiries about the derivatives of the area and perimeter functions. Additionally, some participants express confusion about the geometric interpretation of the rectangle in relation to the semicircle.

Discussion Status

The conversation includes attempts to clarify the geometric setup and the mathematical relationships involved. Some participants have raised questions about the nature of the shape formed when inscribing the rectangle, while others have provided insights into the mathematical expressions needed to analyze the problem. There is no explicit consensus, but the dialogue appears to be productive in exploring the concepts involved.

Contextual Notes

Participants have noted the absence of a specified radius for the semicircle, which may affect the discussion. There are also references to the problem being part of self-directed exercises rather than formal homework, indicating a personal investment in understanding the material.

imbecile
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o:)
here comes the question

A varianble rectangle is inscribed in a given semicircle, so that one side lies along the bounding diameter, and two vertices lie on the bounding arc.
1 Show that wgeb tge area if tge rectangle is greatest, the sides of the rectangle are in the ratio 2:1

2 Show further that when the perimeter of the rectangle has a turning value the sides are in the ratio 4:1,
and determine the nature of the turning value.

Ans:maximum

:smile: :confused:
 
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Last edited by a moderator:
You have a rectangle inscribed in a semi-circle (radius not given so call it R). One side of the rectangle is along the diameter of the semi-circle. If we call the length and width of the rectangle l and w, then the area is lw and the perimeter is 2l+ 2w.
Now: can you write w (and therefore the area and perimeter) as a function of l only?
What is the derivative, with respect to l, of the area and perimeter functions?
 
whozum

excuse me whozum, :bugeye:
if i didn't try my best to figure out this question will i simply post it here??
i had read the that section the first day soon after i become a member here.
if i didn't put any effort on this questions will i put any extra effort to come here and type the question to post it up here? i would rather ignore the question.
BTW, this is not my homework, this is the exercises i make myself do as i didn't go for math tuition or extra classes.
 
HallsoftIvy

okei
if u mention it that way,,,,,,,
can the rectangle be rectangle when inscribed in it with one side of the length is the diameter of the semicircle?
i tried to draw it before i post this question and i found that to be a shape like trapezium..?? :rolleyes:
 
Last edited:
imbecile said:
okei
if u mention it that way,,,,,,,
can the rectangle be rectangle when inscribed in it with one side of the length is the diameter of the semicircle?
Yes, that's what inscribed means!

i tried to draw it before i post this question and i found that to be a shape like trapezium..?? :rolleyes:

? What do you have to do to get a rectangle, rather than a trapezium? Is the side on the diameter of the semicircle symmetric with respect to the center of that line?
 

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