book Maths Puzzle Numerical Ability

The angular velocity of a merry-go-round is 35 radians/minute. If the diameter is 38 feet, find the linear velocity of a person standing on the very edge of the merry-go-round.

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book Other Question
Finding supplementary and complementary angles.
How can 174 degrees have a complementary angle? (y-5)^2=2y^2-9x+5