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Can someone please help me to solve this two problems? I've been sitting for hours trying to understand them.
Here it goes.
A 30 cm string was cut in two pieces. One string was formed as a circle and the second string was shaped as a quadrat.
Show that the sum of the circle and the quadrat's area always exceed 30 cm² regardless where the cut is made.
Found a third problem:
A factory are going to to make cylindershaped cans. The sum of the diameter and height are 80 cm. which measures gives the greatest volume?
Please help me with this!
/Attack.
Hi
Let x be the length of the string shaped as a circle
x is the perimeter of the circle
The radius is
The area is
The length of the other part of the string is 30-x
30-x is the perimeter of the square
The length of one side is
The area is
The total area is
Just study the function A(x)
EDIT : beaten again ! Arghh ....