Measures of the two angles between hour and minute hands of a clock at 9 O’ clock are
A complete circle is of 360° and a clock completes 12 hours in 1 cycle.
When its 9 O’ clock then
hour hand is at 9 and minute hand is at 12.
So, let’s consider the angle by minute hand to be 0 i.e., assuming 12 as the beginning point of counting.
∴ is the angle covered by hour hand.
⇒ Angle between hour hand and minute hand is 270 – 0 = 270°
is the other direction it is 360-270 = 90°.
⇒ B is correct.