If a tangent is drawn from the origin to the circle x ∧ 2 + y ∧ 2-12x + 27 = 0, what is the length of the tangent

Make the circle into standard form: (X-6) ^ 2 + y ^ 2 = 9, the center coordinate is (6,0) radius r = 3
The tangent length of the combination of number and shape is: √ (6 ^ 2-3 ^ 2) = 3 √ 3

RELATED INFORMATIONS

1. A series of general terms and summation problem! If the sequence {an} is an arithmetic sequence with tolerance of 1 / 2, and the sum of the first 100 items is 145, then A2 + A4 + A6 + +a100=? 3Q!
2. If three points a (2,2), B (a, 0), C (0, b) (AB ≠ 0) are collinear, then the value of 1A + 1b is equal to______
3. What's the difference between subtracting the quotient of 5 / 4 divided by 1 / 3 from the reciprocal of 5 / 3?
4. Write natural numbers from 360 to 630 with odd divisors
5. It is known that lim2 ^ n / [2 ^ (n + 1) + (m-2) ^ n] = 1 / 2
6. Ln (1 + x) ^ 2 derivative
7. If limit exists, how to judge LIM (△ x → 0) [f (x0 + △ x) - f (x0 - △ x)] / △ x = f '(x0) error Wrong, it should be LIM (△ x → 0) [f (x0 + △ x) - f (x0 - △ x)] / 2 △ x = f '(x0)
8. F '(x0) = - 2 find the following limits: (1) Lim Δ X - > 0 f (x0 + 3 Δ x) - f (x0) / Δ x (2) limh - > 0 f (x0) - f (x0-h) / h
9. Although Lim f (x) exists, what does Lim f (x) ≠ f (x0) mean Although LIM (x → x0) f (x) exists, what does Lim f (x) ≠ f (x0) mean What is the specific situation? Can you give an example of a function that meets the conditions~ Thank you~
10. If f '(x0) = 2, find Lim [f (x0-k) - f (x0)] / 2K, K tends to 0
11. How to find the derivative of Ln (x + 2)
12. lim2^n +3^n/2^n+1+3^n+1
13. The number of divisors of a number is (?), and the smallest divisor is (?)
14. What's the difference between subtracting 73 from the reciprocal of 53 and 13?
15. If three points a (2,2), B (a, 0), C (0, b) (AB ≠ 0) are collinear, then the value of 1A + 1b is equal to______
16. Make two tangents from the origin to the circle x ^ 2 + y ^ 2-12x + 27 = 0, then the angle between the two tangents is
17. How to find the derivative of LN [x] ^ 2 Known function f [x] = XLN [x ^ 2] {x
18. How to calculate the determinant {1123} {123-1} {3-1-1-2} {23-1-1}
19. The number of divisors of a number is______ Of which the smallest divisor is______ The greatest divisor is______ ．
20. What's the quotient of four fifths of 4.5 minus 1.5 divided by 2.1? The difference between eight percent of 250 and three times of a number is exactly 3.2 What's the quotient of 4.5 minus 1.5 divided by 2.1? The difference between 8% of 250 and 3 times of a number is exactly 3.2?