Choose the devices which helps us to predict time.
Sundial
Watch
Water clock
None of the above
The devices used for measuring time are watches, clocks, sundial, water clock, etc .
Sundial is a device that measures time.
Everyone uses watch to keep track of time. Nowadays most people use digital watches but that hasn't discredited the style of the conventional clock with hands. The angle formed by the hands of a clock at 6:00 pm is a __________.