C. 4.45 cm. you take the circumference and divide it by pi to find the diameter
By the Pythagorean theorem
.. x = √((2√3)^2 -(√6)^2) = √(12 -6) = √6 . . . . cm
x = √6 cm
Yea what the other guy said
Let's find his wpm (words per minute rate).
153 words / 3 minutes
/3 /3
51 words / 1 minute
51 words * 10 minutes = 510
He can type 510 words in 10 minutes