Can anyone me with this question on my geometry homework? (could you also explain it as well? )

What is the square root of 45? (step by step working plz)

What is the area of triangle abc if a = 8, b = 11, and c = 15?

Which of the following could be the ratio of the length of the longer leg 30-60-90 triangle to the length of its hypotenuse? check all that apply. a. 313 6 b. 3: 215 c. 18: 13 d. 1: 13 e. 13: 2 of. 3: 15