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A circle is inscribed in a triangle ABC....

A circle is inscribed in a triangle ABC. It touches the sides AB and AC at M and N respectively. If O is the centre of the circle and `angleA = 70^@` , then what is `angleMON` equal to ?

A

`90^@`

B

`100^@`

C

`110^@`

D

`120^@`

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