Solve pythagoras theorem in Objective-C - objective-c

Question

I am working on a programm which lets you calculate the sides in a triangle using the Pythagoras method. I recently posted my first question about this. How can I code it so that you can also work out B or A. Here is my code so far:
PythagorasCalc.m
#import "PythagorasCalc.h"
#implementation PythagorasCalc
- (double)calculatePythagorasValue {
return sqrt(A*A+B*B);
}
//Access Code
- (double)A {
return A;
}
- (void)setA: (double)value {
if(A != value) {
A = value;
}
}
- (double)B {
return B;
}
- (void)setB: (double)value {
if(B != value) {
B = value;
}
}
- (double)C {
return C;
}
- (void)setC: (double)value {
if(C != value) {
C = value;
}
}
#end
PythagorasCalc.h
#import <Cocoa/Cocoa.h>
#interface PythagorasCalc : NSObject {
#private
int A;
int B;
int C;
}
#property (nonatomic) double A;
#property (nonatomic) double B;
#property (nonatomic) double C;
- (double)calculatePythagorasValue;
#end
AppDelegate.m
#import "PythagorasCalculatorAppDelegate.h"
#implementation PythagorasCalculatorAppDelegate
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
calculator = [[PythagorasCalc alloc] init];
}
- (IBAction)calculateClicked:(id)sender {
double A = _ATextField.doubleValue;
double B = _BTextField.doubleValue;
double C = _CTextField.doubleValue;
calculator.A = A;
calculator.B = B;
calculator.C = C;
_CTextField.doubleValue = [calculator calculatePythagorasValue];
}
#end
AppDelegate.h
#import <Cocoa/Cocoa.h>
#import "PythagorasCalc.h"
#interface PythagorasCalculatorAppDelegate : NSObject <NSApplicationDelegate> {
//Public Calculator Object
PythagorasCalc *calculator;
}
#property (assign) IBOutlet NSWindow *window;
- (IBAction)calculateClicked:(id)sender;
#property (weak) IBOutlet NSTextField *ATextField;
#property (weak) IBOutlet NSTextField *BTextField;
#property (weak) IBOutlet NSTextField *CTextField;
#end