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I need to draw this image using TikZ.

Here is a way to build this figure that uses several key concepts from TikZ:

• the scope
  


• clip


• the use of the intersections library


• the use of node to place text.


• 
  sloped to write text tangent to a path

Their use is explained in the written comments in the code.

documentclass[border=5mm]standalone
usepackagetikz
usetikzlibraryintersections

begindocument

begintikzpicture
% This scope allows you to draw the part of the circle inside the rectangle. The outer part is cut off.
beginscope% use of intersections library to define the intersections between circle and rectangle
draw[name path global=cadre,clip] (0,0) rectangle (3.5,4.5);
draw[name path global=cercle] (3.5,0)circle(4.6cm);
endscope

% draw both sides of the angular sector
draw[name intersections=of=cercle and cadre](intersection-2)--(3.5,0)--(intersection-1)node[above right,midway]h;

% sloped allow to write text tangent to the path
path[above] (intersection-1)to[bend left=15]node[sloped]$c(h)$(intersection-2);

% dimension of rectangle wrtien in 2 differents way
draw [<->](4.2,0)--node[right]q(4.2,4.5);
draw [<->](0,-.6)--(3.5,-.6)node[below,midway]p;
endtikzpicture

enddocument

Using a local bounding box saves us from a lot of hassle here.

documentclass[border=3.14mm,tikz]standalone
begindocument
 begintikzpicture
 node[fill,inner sep=1.5pt,circle] (O) at (0,0);
 beginscope[local bounding box=box]
 draw (O.center) -- (100:4) arc(100:140:4) node[pos=0.7,above,sloped,inner
 xsep=0pt] $c(h)$
 -- node[midway,below] $h$ cycle;
 endscope 
 draw (box.south west) rectangle (box.north east);
 draw[|-|] (1,0|-box.south) -- (1,0|-box.north)node[midway,fill=white]$p$;
 draw[|-|] (0,-1 -|box.west) -- (0,-1 -|box.east)node[midway,fill=white]$q$;
 endtikzpicture
enddocument

A PSTricks solution just for fun.

documentclass[pstricks,12pt]standalone
usepackagepst-eucl
begindocument
beginpspicture[arrowinset=0](-5,-1)(1,5.5)
 pstGeonode[PointSymbol=none,PosAngle=-45](0,0)S
 pnodes(5;150)A(5;100)B
 pswedge(S)5(B)(A)
 psframe(A|S)(S|B)
 rput0(5.4;130)$c(h)$
 pcline(A)(S)ncput*$h$
 pcline[offset=-.5](A|S)(S)ncput*$p$
 pcline[offset=.5](S|B)(S)ncput*$q$
endpspicture
enddocument

Here you go :)

documentclassstandalone
usepackagetikz

begindocument
 begintikzpicture[x=0.75pt,y=0.75pt,yscale=-1,xscale=1,line width=0.75pt]
 draw (46.5,25) -- (145.5,25) -- (145.5,156.33) -- (46.5,156.33) -- cycle ;
 draw (46.5,176.33) -- (145.5,176.33) ;
 draw [shift=(145.5,176.33), rotate = 180] [color=rgb, 255:red, 0; green, 0; blue, 0 ][line width=0.75] (0,5.59) -- (0,-5.59)(10.93,-4.9) .. controls (6.95,-2.3) and (3.31,-0.67) .. (0,0) .. controls (3.31,0.67) and (6.95,2.3) .. (10.93,4.9) ;
 draw [shift=(46.5,176.33), rotate = 0] [color=rgb, 255:red, 0; green, 0; blue, 0 ][line width=0.75] (0,5.59) -- (0,-5.59)(10.93,-3.29) .. controls (6.95,-1.4) and (3.31,-0.3) .. (0,0) .. controls (3.31,0.3) and (6.95,1.4) .. (10.93,3.29) ;
 draw (165.5,156.33) -- (165.5,25) ;
 draw [shift=(165.5,25), rotate = 450] [color=rgb, 255:red, 0; green, 0; blue, 0 ][line width=0.75] (0,5.59) -- (0,-5.59)(10.93,-4.9) .. controls (6.95,-2.3) and (3.31,-0.67) .. (0,0) .. controls (3.31,0.67) and (6.95,2.3) .. (10.93,4.9) ;
 draw [shift=(165.5,156.33), rotate = 270] [color=rgb, 255:red, 0; green, 0; blue, 0 ][line width=0.75] (0,5.59) -- (0,-5.59)(10.93,-3.29) .. controls (6.95,-1.4) and (3.31,-0.3) .. (0,0) .. controls (3.31,0.3) and (6.95,1.4) .. (10.93,3.29) ;
 draw (46.88,52.66) -- (145.5,156.33) ;
 draw (117.77,25) -- (145.5,156.33) ;
 draw [draw opacity=0] (46.88,52.66) .. controls (65.27,35.5) and (89.95,25) .. (117.08,25) .. controls (117.31,25) and (117.54,25) .. (117.77,25) -- (117.08,127.92) -- cycle ; draw (46.88,52.66) .. controls (65.27,35.5) and (89.95,25) .. (117.08,25) .. controls (117.31,25) and (117.54,25) .. (117.77,25) ;

 % Text Nodes
 draw (99,163) node [align=left] $displaystyle p$;
 draw (174,91) node [align=left] $displaystyle q$;
 draw (101,96) node [align=left] $displaystyle h$;
 draw (153,160) node [align=left] $displaystyle s$;
 draw (82,40) node [scale=0.8] [align=left] $displaystyle c( h)$;
 endtikzpicture
enddocument