Area and perimeter of circle and triangle

#include<stdio.h>
#include<math.h>
int main()
{
	int choice1,choice2;
	float r,a,p,x,y,z,s,h,b;
	printf("Press 1 to calculate the area and perimeter of a circle\n");
	printf("Press 2 to calculate the area and perimeter of a triangle\n");
	printf("Enter your choice - ");
	scanf("%d",&choice1);
	printf("\n");
	
	switch(choice1)
	{
		case 1 :
		{
			printf("Enter the radius of the circle ");
			scanf("%f",&r);
			a=3.14*r*r;
			p=2*3.14*r;
			printf("The area of the circle is %f\n",a);
			printf("The perimeter of the circle is %f\n",p);
			break;
		}
		case 2 :
		{
			printf("Press 1 to calculate the area and perimeter of the triangle using length of 3 sides\n");
			printf("Press 2 to calculate the area of the triangle using lengths of it's height and base\n");
			printf("Enter your choice - ");
			scanf("%d",&choice2);
			printf("\n");
			
			switch(choice2)
			{
				case 1 :
				{
					printf("Enter the sides of the triangle - ");
					scanf("%f %f %f",&x,&y,&z);
					s=(x+y+z)/2;
					a=sqrt(s*(s-x)*(s-y)*(s-z));
					p=x+y+z;
					printf("The area of the triangle is %f\n",a);
					printf("The perimeter of the triangle is %f\n",p);
					break;
				}
				case 2 :
				{
					printf("Enter the lengths of height and base of the triangle respectively - ");
					scanf("%f %f",&h,&b);
					a=0.5*h*b;
					printf("The area of the triangle is %f\n",a);
					break;
				}
				default :
					printf("Wrong input\n");
			}
		}
	}
	return 0;
}