English maths problems about Complex number

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English maths problems about Complex number
Express the follwing complex numbers in polar form
(a)2 (b)-4 (c) 3i (d) -2i
Is there anyone can give me detail answers
Thanks for helping me
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(a) 2=2+0*i=2*cos0°+2*sin0°i
polar form:2∠0°
(b)-4 = 4*cos180°+4*sin180°i
polar form:4∠180°
(c)3 = |3i|sina,0=|3i|cosa,a = 90°,|3i|=3
polar form:3∠90°
(d)-2=|-2i|sina,0=|-2i|cosa,a=-90°,|-2i|=2
polar form:2∠-90°

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