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Question Number 11221 by b.e.h.i.8.3.4.1.7@gmail.com last updated on 17/Mar/17

Commented by mrW1 last updated on 18/Mar/17

center point of the circle M(a,a)  radius of the circle R=(a−1)(√2)  sin (θ/2)=(R/(a(√2)))=∣((a−1)/a)∣≤1  θ=2sin^(−1) (∣((a−1)/a)∣), ∣a∣≥(1/2)  when ∣a∣→(1/2), θ→180°  when ∣a∣→1, θ→0°  when ∣a∣→∞, θ→180°

centerpointofthecircleM(a,a)radiusofthecircleR=(a1)2sinθ2=Ra2=∣a1a∣⩽1θ=2sin1(a1a),a∣⩾12whena∣→12,θ180°whena∣→1,θ0°whena∣→,θ180°

Commented by b.e.h.i.8.3.4.1.7@gmail.com last updated on 17/Mar/17

hello mrW1.thank you so much.but  i think,this is a very spicial case of  quistion.centre of circle my not alwyes  lie on the line y=x.

hellomrW1.thankyousomuch.butithink,thisisaveryspicialcaseofquistion.centreofcirclemynotalwyeslieontheliney=x.

Commented by mrW1 last updated on 17/Mar/17

the curve xy=1 is symmetric about the  line y=x. for a circle which tangents  the curve xy=1 at (1,1) its center must  be on the line y=x.

thecurvexy=1issymmetricabouttheliney=x.foracirclewhichtangentsthecurvexy=1at(1,1)itscentermustbeontheliney=x.

Commented by mrW1 last updated on 18/Mar/17

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