# how to find the centroid of a semicircle

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Centroids of semicircles and hemispheres

The place is the centroid of a semicircle? When you minimize out a semicircle from a sheet of uniform density cardboard, over which level might you, rigorously, stability it on the highest of a pin?

If you do not know the reply, give it some thought for a few seconds. Does your instinct provide you with a clue?

Studying: easy methods to discover the centroid of a semicircle

### Resolution

Let’s use some calculus to derive the reply.:

We will mannequin a semicircle as a stack of infinitesimly skinny strips. If we sum the second of all these strips, normalized over the realm of ​​the whole half-circle, we will discover the centroid. The centroid is the situation that we will mannequin the form as if the whole weight acts by way of this level.

From symmetry, we will see that the centroid lies alongside the y-axis, which acts like a mirror to the quarter circles both facet. We simply want to find out how far up this level is.

That is roughly 42.44% of the radius.

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I do not learn about you, however this reply shocked me a little bit. I’d not have predicted it will be an irrational proportion.

### Transferring to 3D

If a semicircle is extruded into an arch (of uniform density), then the centroid stays on the 42.44% place from the bottom. However the place is the centroid of a hemi-sphere?

Is it the identical? Let’s have a look…

### Hemisphere

Do you suppose this form could have a special centroid?

As earlier than we will mannequin this as a pile of infinitesimally skinny round pancakes stacked ontop of one another. We will sum up the second of all these disks and divide by the amount of half the sphere.

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Do you will have any instinct concerning the consequence?

That is 37.50% of the radius.

That is an fascinating consequence. It is a little bit cleaner than the system for a semicircle and doesn’t contain π. The centroid is a little bit nearer the bottom of the dome.

Is that this a consequence you anticipated? It is sensible when you think about {that a} hemisphere tapers in two axes because it strikes from base to tip, so we should always anticipate the centroid to be nearer the bottom.

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