What are certainty, proof of intuition and proof of contrapositive?

1.a cylindrical water tank has a diameter of 6 feet and a height of 10ft. how many liters of water can the tank hold2.each member of a family of 10 uses 200 liters of water daily. how many cubic meters of water does the family use in one month​

Which minor arcs are congruent? explain your answer.

Write 9_2 in scientific notation