Can someone please help me with this question. I keep getting it wrong

Density, density, density. (a) A charge -352e is uniformly distributed along a circular arc of radius 7.00 cm, which subtends an angle of 50. What is the linear charge density along the arc? (b) A charge -352e is uniformly distributed over one face of a circular disk of radius 3.60 cm. What is the surface charge density over that face? (c) A charge -3526 is uniformly distributed over the surface of a sphere of radius 2.30 cm. What is the surface charge density over that surface? (cl) A charge -352e is uniformly spread through the volume of a sphere of radius 440 cm. What is the volume charge density in that sphere? (a) Number I Units 3 (b) Number a Units 3 (c) Number a Units G (D (d) Number a Units change We know linean charge density (2 ) : length ST . unit of charge - Coulombs . ( c ) SI . whit of Length meter ( mn ) unit of > - (7/m. ) Surface charge density + ( 0 ) = Charge surface area ST. limit of change -Corelomb ( C ) si unit of area ( meter ? ) - ( my ) so wit of 6 - you it is also same as (6 ) as it wants Surface charge density . volume charge densits ( e ) - Charge S.I. wilt of- volume -( meter3 ) (an3 ) SI cunit of P ->Now for The formulas I have used . for the are length. uses Let total Length = L = ( 2018 . ) this I is for angle + 21 ( 360 " ) for Length t -> L . 27 If we have O in degree Here. 7 l = L then we know & in read 360 - 217 " QC - 21 xo rad 217 as 271 is in ? 360 radian 180 6 for a disk surface area Surface of sphere volume of sphere