01:53:15 The law of cosines for ARST can be set up as 52 = 72 + 32 - 2(7)(3)cos(s). What could be true about ARST?
x
Law of cosines: a2 = b2 + c2 - 2bccos(A)
Or=5 and t = 7
Or= 3 and t = 3
Os = 7 and t = 5
Os = 5 and t = 3

eveidence i thing that

step-by-step explanation:

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step-by-step explanation:

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we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4