# I don't know how to calculate a tennis racquet head size thanks!

1. Dec 6, 2007

### YKD

Hi everybody,
The area of a tennis racquet head size is like an egg shape, not oval shape.
how to calculate it?

Thank you so much for your help ^_^

2. Dec 6, 2007

### HallsofIvy

Staff Emeritus
Unfortunately there are just too many different shapes for an "egg shape" for there to be any good formula. I think you will have to approximate the area by treating it as if the tennis racquet head were an oval or an "ellipse" for which there is an area formula: $A= \pi ab$ where a and b are half the distance across the racquet head measured where it is narrowest and widest.

In other words, you are really using the formula for area of a circle, but, because an "ellipse" does not have a single "radius", instead of r2, you multiply together the values for smallest "radius" and largest "radius".

3. Dec 6, 2007

### YKD

Thank you, HallsofIvy ^_^
The headsize of my racquet is 89.5 square inch that someone said
but the brand said 93.
Using W x L x 0.8 is closer to this area.
I should use 22/7 x a x b or W x L x 0.8 to caculate the racquet headsize?
http://www.tennis-warehouse.com/viewlarge.html?PCODE=LMP

I'd like to calculate it by myself.

Thanks!

4. Dec 6, 2007

### Invictious

Yes that would be a good idea.

Another idea to do might to be use Integration (just plot half the racquet onto the aces, find the area under the curve, then multiply by 2), though I'm not sure if you have done that before, but either way, it probably will be more accurate.

5. Dec 6, 2007

### YKD

It seems quite complicated...
My racquet stringbed (hoop not included)
length:12.25 inch, width 9 inch

Thank you ^_^

6. Dec 6, 2007

### CRGreathouse

I took the picture and put an ellipse with that ratio inside the stringbed and found that it fit fairly well. If it touches on the top, bottom, and two sides there's a tiny bit of space on the diagonals (thus egg-shaped rather than elliptical) so whatever area we calculate should probably be rounded up sooner than down.

12.25 * 9 * pi / 4 is about 86.6, so I'd say an area of 87 or 88 square inches wouldn't be out of line.

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7. Dec 6, 2007

### YKD

Thank you very much, CRGreathouse ^_^

Perhaps this racquet is difficult to calculate,right?
http://www.tennis-warehouse.com/viewlarge.html?PCODE=RQIS1T