% This is the sample program of unit1 redone
% in MATLAB
% A sample program              file: 8ex2.m
%  FALL 2001
%   ___________________________________
%  Jacob Y. Kazakia   jyk0
%  September 4, 2001
%  Recitation Instructor: J.Y.Kazakia
%  Recitation Section  01
%   ___________________________________

%   Purpose: This program calculates the area of a sector 
%            of circle, given the radius of the circle in 
%            meters and the angle of the sectorin degrees.
             
%   Algorithm: The area of the entire circle is given by 
%              the formula:
%             Area = pi * radius * radius (here   pi = 3.1415927 )
%             If the sector angle is  theta degrees, then its area is: 

%           Sector_area = ( theta / 360 ) * pi * radius * radius

%  PROMPT FOR AND READ THE INPUT

radius = input(' \n\nEnter the radius of the circle in meters >>>');
theta = input(' \n\nEnter the angle of sector in degrees >>>');

%  ECHO PRINT THE ENTERED VALUES

fprintf(' \n\n We will now calculate the area of a sector of a circle \n' );
fprintf(' The radius of the circle ( meters) was given as : %5.2f   \n' , radius ); 
fprintf(' The angle of the sector ( degrees) was given as:  %5.1f   \n ' , theta );   

 %  calculation ( do you really need a computer for this? )

area = (theta/360 )* pi * radius * radius;

fprintf(' The area ( square meters)is calculated as :  %5.2f ' , area );