70.Why is 1 degree =60 minutes

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Q. Why 1 minute had 60 seconds

Q. A bucket full of hot water is kept in a room and it cools from

75^{\circ} C

70^{\circ}

T_{1}

minutes, from

70^{\circ} C

65^{\circ} C

T_{2}

minutes and from

65^{\circ} C

60^{\circ} C

T_{3}

minutes. Then

Calculate the angle of (a) $1^{\circ}$ (degree) (b) $1^{'}$ (minute of arc or arc min) and (c) $1^{''}$ (second of arc or arc second) in radians.
Use $360^{\circ} = 2 π$ radian, $1^{\circ} = 60^{'}$ and $1^{'} = 60^{''}$

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