Area of a Semicircle from Diameter and Radius | Geometry

How do we find the area of a semicircle with diameter? How do we find the area of a semicircle with radius? We'll go over both types of problems in today's geometry video lesson. The diameter of a circle is a segment that has both endpoints on the circle and passes through the center, and the radius is half the diameter. With either piece of information, we can calculate the area of a full circle, and then just divide that by 2 to get the area of a semicircle with the same diameter or radius.

Remember, area of a circle is pi*r^2, so just divide that by two for the area of a semicircle! We also touch on the fact that we're actually calculating the area of half-disks, not semicircles. But we usually just call them semicircles anyways.

#math #geometry

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[strawberrylittlegachas]

This was the only video on YouTube that actually helped me tysm!

[NOTHyliafficial]

Thank you so much this is just what I neeeed

[punditgi]

Can you do a proof of the formulas for the circumference and the area of a circle?

[SaeedAbu-AlMakarem]

Can u make a video about composite figures?

[fabianortiz]

Since when was 2R a division and not multiplication? I still don’t understand

[matyasdaniel]

Hey man! Thanks for the great video.
I have a request, but I do not know where to post it, so I am going to write it here, below your latest video.

Would you do a video on Darboux property? I encountered this exercise:

Let f:R->R be a function and "a" a real number. f(x) = cos(1/x), if x != 0 and f(x) = a, if x = 0.
If f has Darboux property what values can "a" have?

I would want a theoretical video first and foremost, if possible, but a solution to this problem would be great too.

[Nfz-mc]

Thanks you made me get my grade to a 100 in my math grade

[Gianna.Padilla]

Isn't the last one approximately 25.12 in squared