What's the square of 12

2 times the square of root 3
Or the length of one right side of a right triangle is 2, the hypotenuse is 4, and the square of the other right side is 12
Or 3.46410161513775 square close to 12

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1. Given the square of a + the square of B = 25, ab = 12, find a + B
2. 12 square decimeters equals () square meters
3. 9-1 = 8 × 1,25-9 = 8 × 2,49-25 = 8 × 3,81-49 = 8 × 4 ·· these equations reflect the law of natural numbers. Let n denote the equation of natural numbers with n
4. Observe the following equations: 9-1 = 8, 16-4 = 12, 25-9 = 16, 36-16 = 20 Let n be a positive integer. The following equation is () A. （n+2）2-n2=4（n+1）B. （n+1）2-（n-1）2=4nC. （n+2）2-n2=4n+1D. （n+2）2-n2=2（n+1）
5. Observe the following equation: 9 × 0 + 1 = 19 × 1 + 2 = 119 × 2 + 3 = 219 × 3 + 4 = 319 × 4 + 5 = 41 According to the law reflected in the number table, we guess that the nth equation (n is a positive integer) should be () A. 9（n-1）+n=10（n-1）+1B. 9n+n=（n-1）+1C. 9n+（n-1）=n2-1D. 9n+n+1=10n+1
6. 9×0+1＝1 9×1+2＝11 9×2+3＝21 9×3+4＝31 9×4+5＝41 … guess 9×0+1＝1 9×1+2＝11 9×2+3＝21 9×3+4＝31 9×4+5＝41 … Guess: what can the nth formula (n is a positive integer) be expressed by N?
7. If the square of (a + 21) = 1512900, then (a + 11) times (a + 31) equals
8. What's 21 times 4 / 7? What's 100 * 2 / 5? What's 9 times 1 / 7
9. 9 * 0 + 1 = 1 9 * 1 + 2 = 11 9 * 2 + 3 = 21 what is the process of guessing the nth equation and the solution I don't know the rules,
10. Why is the square of 13 = B + C, B = 5, C = 12
11. How many meters is 12 square meters
12. How many meters is 12 square meters? Such as the title
13. What is the square of 12 + a?
14. 2 / 3 × [3 / 2 × (quarter x) - 4 / 2] - 2 = what is x equal to,
15. 4.2 to 1 is a quarter to eight to five
16. One two fourths equals four four eighths equals six sixths, right? Please correct? How do you understand this? Please explain the basic principle and its formula?
17. 2 / 1: x = 4 / 1:10 / 1 is 2:1: x = 4:1:10:1 how to calculate? How much is it equal to?
18. Is the inverse theorem that the central line on the hypotenuse of a right triangle is equal to half of the hypotenuse true? How do you prove it,
19. 1: Write "equal to vertex angle" as "if. Then." form 2: is there an inverse theorem for theorem "equal to vertex angle"? No counterexample is given
20. Take a counter example to show that "the median line of a triangle is equal to half of its three sides" has no inverse theorem Have a picture. I'll wait! It's best in 10 minutes. Maybe you can give me some ideas