Which set is similar?

Are the triangle shown in the figure below similar? If so, by which test of similarity?

Are the triangle shown in the figure below similar? If so, by which test of similarity?

Choose the set of numbers from the four alternative sets, which is similar to the given set. Given set : (63, 49, 35)

Choose the set of numbers from the four alternative sets, which is similar to the given set. Given set : (51, 25, 12)

Choose the set of numbers from the four alternative sets, which is similar to the given set. Given set : (223, 324, 425)

Choose the set of numbers from the four alternative sets, which is similar to the given set. Given set : (32, 24, 8)

Choose the set of numbers from the four alternative sets, which is similar to the given set. Given set : (6, 15, 28)

Choose the set of numbers from the four alternative sets, which is similar to the given set. Given set : (224, 15, 4)

Choose the set of numbers from the four alternative sets, which is similar to the given set. Given set : (81, 77, 69)