"how To Draw The Perfect Circumference Of A Circle - The Geometrical And Mathematical Way!"

Determine the length of the circumference for a circle of radius 21mm.
Construction:
1. With the center O draw a circle of radius 21mm.
Draw a diameter AB.
2. Draw a tangent AC equals 3 times of AB.
3. Draw a radius OD making an angle of 30º with OB.
4. From D draws a line DE perpendicular to line OB.
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#Circumference #Engineeringdrawing #Technicaldrawing

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[@Slimebouncy]

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[@niteshmeena1959]

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[@transformyourmind5702]

please I have demand from you , I have problem in Quantum mechanics ( I SOLVED IT BUT I DOUBT in my solution , please i need ensure from you for my solution true or false ? )
please upload video for solve the following problem :
The wave function of particle trapped in an infinite square well potential of width 2a is found to be :
epsi (wave function )= c ( cos pi x/2a + sin 3pi x/a + 0.25 cos 3pi x/2a ) inside the well , = 0 outside the well
(i) Calculate the coefficient C
(II) If a measurement of the total energy is made , what are the possible results of such a measurement , and what is the probability to measure each of them ?

[@technicaldrawing]

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[@transformyourmind5702]

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today i will send you solved examples and send you my try solution on your Email . but I don't want tired you with me my dear
the subject : Quantum mechanics
The title : probability of found a particle in ifinite square well potential in one dimension box
my Email : [e-mail] your brother (Magdy)
Thank you very much