What is the exact area of a circle with a diameter of 12 feet?

Antonio made a scale model of a building. the model's scale is 1 inch to 235 feet and its height is 3.5 inches. what is the exact height of the actual building? enter your answer in the box.

Type the correct answer in each box. spell all the words correctly, and use numerals instead of words for numbers. if necessary, use / for the fraction bar(s).

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.