Harriot, Thomas
,
Mss. 6785
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130 - 139
140 - 149
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210 - 219
220 - 229
230 - 239
240 - 249
250 - 259
260 - 269
270 - 279
280 - 289
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300 - 309
310 - 319
320 - 329
330 - 339
340 - 349
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430 - 439
440 - 449
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<
head
xml:space
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preserve
"
xml:lang
="
lat
"> Invenire diamterum sphæræ
<
lb
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in tetraedro
<
lb
/>
[
<
emph
style
="
bf
">Translation: </
emph
>
To find the diameter of a spehre inscribed in a ]</
head
>
<
p
xml:lang
="
lat
">
<
s
xml:space
="
preserve
"> Sit tetraædrum
<
math
>
<
mstyle
>
<
mi
>a</
mi
>
<
mi
>b</
mi
>
<
mi
>c</
mi
>
<
mi
>d</
mi
>
</
mstyle
>
</
math
>
<
lb
/>
<
math
>
<
mstyle
>
<
mi
>g</
mi
>
</
mstyle
>
</
math
>
vero centrum trianguli
<
math
>
<
mstyle
>
<
mi
>a</
mi
>
<
mi
>b</
mi
>
<
mi
>c</
mi
>
</
mstyle
>
</
math
>
<
lb
/>
Sit
<
math
>
<
mstyle
>
<
mi
>d</
mi
>
<
mi
>g</
mi
>
</
mstyle
>
</
math
>
diameter sphæræ
<
lb
/>
circumscribentis. et
<
math
>
<
mstyle
>
<
mi
>f</
mi
>
</
mstyle
>
</
math
>
centrum.
<
lb
/>
<
math
>
<
mstyle
>
<
mi
>a</
mi
>
<
mi
>e</
mi
>
</
mstyle
>
</
math
>
,
<
math
>
<
mstyle
>
<
mi
>b</
mi
>
<
mi
>e</
mi
>
</
mstyle
>
</
math
>
,
<
math
>
<
mstyle
>
<
mi
>c</
mi
>
<
mi
>e</
mi
>
</
mstyle
>
</
math
>
, sunt latera cubi
<
lb
/>
inscripti in eadem sphæra.
<
lb
/>
<
math
>
<
mstyle
>
<
mi
>b</
mi
>
<
mi
>g</
mi
>
<
mi
>h</
mi
>
</
mstyle
>
</
math
>
recta est perpendicularis ad
<
math
>
<
mstyle
>
<
mi
>a</
mi
>
<
mi
>c</
mi
>
</
mstyle
>
</
math
>
.
<
lb
/>
et ad diametrum sphæræ
<
math
>
<
mstyle
>
<
mi
>d</
mi
>
<
mi
>g</
mi
>
<
mi
>e</
mi
>
</
mstyle
>
</
math
>
.
<
lb
/>
Est igitur
<
math
>
<
mstyle
>
<
mi
>b</
mi
>
<
mi
>g</
mi
>
<
mi
>e</
mi
>
</
mstyle
>
</
math
>
triangulum rectangulum
<
lb
/>
si habentur
<
math
>
<
mstyle
>
<
mi
>g</
mi
>
<
mi
>e</
mi
>
</
mstyle
>
</
math
>
, dabitur
<
math
>
<
mstyle
>
<
mi
>f</
mi
>
<
mi
>g</
mi
>
</
mstyle
>
</
math
>
semidiameter
<
lb
/>
sphæræ
<
lb
/>
[
<
emph
style
="
bf
">Translation: </
emph
>
Let there be a tetrahedron
<
math
>
<
mstyle
>
<
mi
>a</
mi
>
<
mi
>b</
mi
>
<
mi
>c</
mi
>
<
mi
>d</
mi
>
</
mstyle
>
</
math
>
with
<
math
>
<
mstyle
>
<
mi
>g</
mi
>
</
mstyle
>
</
math
>
the centre of the triangle
<
math
>
<
mstyle
>
<
mi
>a</
mi
>
<
mi
>b</
mi
>
<
mi
>c</
mi
>
</
mstyle
>
</
math
>
. Let
<
math
>
<
mstyle
>
<
mi
>d</
mi
>
<
mi
>g</
mi
>
<
mi
>e</
mi
>
</
mstyle
>
</
math
>
be the diameter of the circumscribing sphere, and
<
math
>
<
mstyle
>
<
mi
>f</
mi
>
</
mstyle
>
</
math
>
the centre.
<
math
>
<
mstyle
>
<
mi
>a</
mi
>
<
mi
>e</
mi
>
</
mstyle
>
</
math
>
,
<
math
>
<
mstyle
>
<
mi
>b</
mi
>
<
mi
>e</
mi
>
</
mstyle
>
</
math
>
,
<
math
>
<
mstyle
>
<
mi
>c</
mi
>
<
mi
>e</
mi
>
</
mstyle
>
</
math
>
, are the sides of cubes inscribed in the same sphere. The straight line
<
math
>
<
mstyle
>
<
mi
>b</
mi
>
<
mi
>g</
mi
>
<
mi
>h</
mi
>
</
mstyle
>
</
math
>
is perpendicular to
<
math
>
<
mstyle
>
<
mi
>a</
mi
>
<
mi
>c</
mi
>
</
mstyle
>
</
math
>
and to
<
math
>
<
mstyle
>
<
mi
>d</
mi
>
<
mi
>g</
mi
>
<
mi
>e</
mi
>
</
mstyle
>
</
math
>
, the diameter of the sphere. Therefore
<
math
>
<
mstyle
>
<
mi
>b</
mi
>
<
mi
>g</
mi
>
<
mi
>e</
mi
>
</
mstyle
>
</
math
>
is a right-angled triangle; if we have
<
math
>
<
mstyle
>
<
mi
>g</
mi
>
<
mi
>e</
mi
>
</
mstyle
>
</
math
>
then we are given
<
math
>
<
mstyle
>
<
mi
>f</
mi
>
<
mi
>g</
mi
>
</
mstyle
>
</
math
>
, the semidiameter of the sought sphere. </
s
>
</
p
>
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>
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