The perimeters of two similar triangles are 25 cm and 15 cm respectively. If one side of the first triangle is 9 cm, then the corresponding side of second triangle is __________.

13

The value of is _____.

14

If tan(A+B) = √3 and tan then the value of A is _______.

16

If 5 tanθ = 3, then what is the value of ?

17

The areas of two circles are in the ratio 9:4, then what is the ratio of their circumferences?