$\"\"$

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The vertices of triangle are $\"\"$ , $\"\"$ and $\"\"$ .

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Let $\"\"$ , $\"\"$ and $\"\"$ .

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Angle between two vectors : $\"\"$ .

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Find angle $\"\"$ between AB and AC.

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The vector from $\"\"$ to $\"\"$ is $\"\"$ .

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The vector from $\"\"$ to $\"\"$ is $\"\"$ .

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Magnitude of AB is $\"\"$ .

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Magnitude of AC is $\"\"$ .

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Dot product of AB and AC is $\"\"$ .

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Angle $\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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Find angle $\"\"$ between AB and BC.

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The vector from $\"\"$ to $\"\"$ is $\"\"$ .

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The vector from $\"\"$ to $\"\"$ is $\"\"$ .

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Magnitude of AB is $\"\"$ .

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Magnitude of BC is $\"\"$ .

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Dot product of AB and BC is $\"\"$ .

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Angle $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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Properties of triangle : Sum of all triangle is $\"\"$ .

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$\"\"$

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$\"\"$

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Interior angles of the triangle are $\"\"$ , $\"\"$ and $\"\"$ .