tolong dijawab no 2 dan 3 pake caranya

2. Iya, karena perbandingan sisi-sisi yg bersesuaian sama, yaitu 2/6 = 5/15 = 1/3

3. a. 4/2 = 10/x
4x = 20
x = 20/4
x = 5
b. 4/y = 5/10
5y = 40
y = 40/5
y = 8