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Anton Petrunin
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YesIf the arcs bend the other way, then "yes"; otherwise there is an obvious counterexample.

Note that the statement holds if $c\in [a,b]$. Moreover, if the arcs $ac$ and $bc$ are tangent to the arc $ab$ at $a$ and $b$ respectively, then equality holds. Furthermore, note that we can assume that $ac$ and $bc$ are tangent to $ab$.

On the following diagram, if arcs look tangent, then they are.

enter image description here

Observe that $|ab|=|ac|+|cx|+|xb|\geqslant |ac|+|cb|$, where $|{*}{*}|$ denotes the length of the arc.

Yes.

Note that the statement holds if $c\in [a,b]$. Moreover, if the arcs $ac$ and $bc$ are tangent to the arc $ab$ at $a$ and $b$ respectively, then equality holds. Furthermore, note that we can assume that $ac$ and $bc$ are tangent to $ab$.

On the following diagram, if arcs look tangent, then they are.

enter image description here

Observe that $|ab|=|ac|+|cx|+|xb|\geqslant |ac|+|cb|$, where $|{*}{*}|$ denotes the length of the arc.

If the arcs bend the other way, then "yes"; otherwise there is an obvious counterexample.

Note that the statement holds if $c\in [a,b]$. Moreover, if the arcs $ac$ and $bc$ are tangent to the arc $ab$ at $a$ and $b$ respectively, then equality holds. Furthermore, note that we can assume that $ac$ and $bc$ are tangent to $ab$.

On the following diagram, if arcs look tangent, then they are.

enter image description here

Observe that $|ab|=|ac|+|cx|+|xb|\geqslant |ac|+|cb|$, where $|{*}{*}|$ denotes the length of the arc.

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Anton Petrunin
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Yes.

Note that equalitythe statement holds if $c\in [a,b]$.

Furthermore Moreover, note that we can assume thatif the arcs $ac$ and $bc$ are tangent to thethe arc $ab$ at $a$ and $b$ respectively, then equality holds. Furthermore, note that we can assume that $ac$ and $bc$ are tangent to $ab$.

On the following diagram, if arcs look tangent, then they are assumed to be tangent.

enter image description here

Observe that $|ab|=|ac|+|cx|+|xb|\geqslant |ac|+|cb|$, where $|{*}{*}|$ denotes the length of the arc.

Yes.

Note that equality holds if $c\in [a,b]$.

Furthermore, note that we can assume that arcs $ac$ and $bc$ are tangent to the arc $ab$ at $a$ and $b$ respectively.

On the following diagram, if arcs look tangent, then they are assumed to be tangent.

enter image description here

Observe that $|ab|=|ac|+|cx|+|xb|\geqslant |ac|+|cb|$, where $|{*}{*}|$ denotes the length of the arc.

Yes.

Note that the statement holds if $c\in [a,b]$. Moreover, if the arcs $ac$ and $bc$ are tangent to the arc $ab$ at $a$ and $b$ respectively, then equality holds. Furthermore, note that we can assume that $ac$ and $bc$ are tangent to $ab$.

On the following diagram, if arcs look tangent, then they are.

enter image description here

Observe that $|ab|=|ac|+|cx|+|xb|\geqslant |ac|+|cb|$, where $|{*}{*}|$ denotes the length of the arc.

Source Link
Anton Petrunin
  • 45k
  • 14
  • 135
  • 299

Yes.

Note that equality holds if $c\in [a,b]$.

Furthermore, note that we can assume that arcs $ac$ and $bc$ are tangent to the arc $ab$ at $a$ and $b$ respectively.

On the following diagram, if arcs look tangent, then they are assumed to be tangent.

enter image description here

Observe that $|ab|=|ac|+|cx|+|xb|\geqslant |ac|+|cb|$, where $|{*}{*}|$ denotes the length of the arc.