Clawson Point

Geometry Level 3

Find the minimum area, A min A_{\min} , of a triangle in which the Clawson Point is a distance of 3, 4, and 5 units from the triangle's vertices. Submit 1 0 4 A min \lfloor 10^4 A_{\min}\rfloor .


The answer is 19885.

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1 solution

Yuriy Kazakov
May 13, 2021

Triangle A B C ABC with vertex

A = ( 5 , 0 ) A=(-5,0)

B ( t ) = ( 4 cos t , 4 sin t ) B(t)=(4 \cos{t},4 \sin{t})

C ( s ) = ( 3 cos s , 3 sin s ) C(s)=(3 \cos{s},3 \sin{s})

Solution of problem is triangle A B C ABC with Clawson point ( 0 , 0 ) (0,0) .

Examples of the locus of Clawson point for t = c o n s t t=const and s = 0..2 π s=0..2 \pi - purple line

1.

2.

3.

Use Phyton.

Find t , s t,s and B ( t ) , C ( s ) B(t), C(s) - that

h a tan A = h b tan B = h c tan C \frac{h_a}{\tan {A}} = \frac{h_b}{\tan {B} }= \frac{h_c}{\tan {C} }

h a h_a - distance from point ( 0 , 0 ) (0,0) to line B C BC , h b h_b - distance from point ( 0 , 0 ) (0,0) to line A C AC , h c h_c - distance from point (0,0) to line A B AB , A , B , C A,B,C - are angles of triangle A B C ABC .

Result is

t = 1.07831535 t =1.07831535

s = 1.05850050 s=1.05850050

n o r m a = 1.0154 e 11 norma=1.0154e-11

S = 1.9886140685 S =1.9886140685

My answer 19886 - is mistake. I change it to 19885 - it is true.

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variant t=1.07824935 s=1.0584355 norma=2.06515233480262e-10 S =1.988535489206
variant t=1.07825035 s=1.0584365 norma=1.82798782359453e-10 S =1.9885368450312
variant t=1.07825135 s=1.05843755 norma=1.70868599538155e-10 S =1.988538200853
variant t=1.07825235 s=1.0584385 norma=1.70724570969985e-10 S =1.9885395566739
variant t=1.07831035 s=1.0584955 norma=1.34638396283964e-10 S =1.988607289985
variant t=1.07831135 s=1.0584965 norma=8.617407644109922e-11 S =1.988608645690
variant t=1.07831235 s=1.0584975 norma=4.94936268490563e-11 S =1.9886100013925
variant t=1.07831335 s=1.0584985 norma=2.459693172609196e-11 S =1.9886113570929
variant t=1.07831435 s=1.0584995 norma=1.148388172697024e-11 S =1.98861271279128
variant t=1.07831535 s=1.0585005 norma=1.015435874097598e-11 S =1.9886140684875

P.S. Clawson Point max Area Problem

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