diff --git a/homework-01-two-circles/main.c b/homework-01-two-circles/main.c
new file mode 100644
index 0000000..f9df9ac
--- /dev/null
+++ b/homework-01-two-circles/main.c
@@ -0,0 +1,86 @@
+#include <bits/pthreadtypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <stdbool.h>
+
+#ifdef __PROGTEST__
+#define debug(...) ((void)0)
+#else
+#define debug(fmt, ...) fprintf(stdout, "[%s:%d %s()] " fmt "\n", __FILE__, __LINE__, __func__, ##__VA_ARGS__)
+#endif
+
+// https://www.geeksforgeeks.org/dsa/area-of-intersection-of-two-circles/
+double intersection_area(double a_r, double b_r, double distance) {
+	double a_square = a_r * a_r;
+	double b_square = b_r * b_r;
+	double distane_square = distance * distance;
+
+	double alpha = acos((distane_square + a_square - b_square) / (2 * a_r * distance)) * 2;
+	double beta = acos((distane_square + b_square - a_square) / (2 * b_r * distance)) * 2;
+
+	double a1 = 0.5 * beta * b_square - 0.5 * b_square * sin(beta);
+	double a2 = 0.5 * alpha * a_square - 0.5 * a_square * sin(alpha);
+
+	double area = a1 + a2;
+
+	debug("Area = %lf", area);
+
+	return area;
+}
+
+double circle_area(double radius) {
+	return M_PI * radius * radius;
+}
+
+int main() {
+	double a_center_x = 0, a_center_y = 0, a_radius = 0, b_center_x = 0, b_center_y = 0, b_radius = 0;
+
+	printf("Zadejte parametry kruznice #1:\n");
+
+	int inputs_read = scanf("%lf %lf %lf", &a_center_x, &a_center_y, &a_radius);
+	if(inputs_read != 3 || a_radius <= 0) {
+		printf("Nespravny vstup.\n");
+		return EXIT_FAILURE;
+	}
+
+	printf("Zadejte parametry kruznice #2:\n");
+
+	inputs_read = scanf("%lf %lf %lf", &b_center_x, &b_center_y, &b_radius);
+	if(inputs_read != 3 || b_radius <= 0) {
+		printf("Nespravny vstup.\n");
+		return EXIT_FAILURE;
+	}
+
+
+	double center_distance = sqrt((b_center_x - a_center_x) * (b_center_x - a_center_x) + (b_center_y - a_center_y) * (b_center_y - a_center_y));
+
+	double radii_sum = a_radius + b_radius;
+	if(a_center_x == b_center_x && a_center_y == b_center_y && a_radius == b_radius) {
+		printf("Kruznice splyvaji, prekryv: %lf\n", circle_area(a_radius));
+	} else if(center_distance <= a_radius - b_radius) {
+		debug("B radius = %lf", b_radius);
+		debug("Double A radius = %lf", a_radius * 2);
+		if(a_radius == 2 * b_radius) {
+			printf("Vnitrni dotyk, kruznice #2 lezi uvnitr kruznice #1, prekryv: %lf\n", circle_area(b_radius));
+		} else {
+			printf("Kruznice #2 lezi uvnitr kruznice #1, prekryv: %lf\n", circle_area(b_radius));
+		}
+	} else if(center_distance <= b_radius - a_radius) {
+		debug("A radius = %lf", a_radius);
+		debug("Double B radius = %lf", b_radius * 2);
+		if(b_radius == 2 * a_radius) {
+			printf("Vnitrni dotyk, kruznice #1 lezi uvnitr kruznice #2, prekryv: %lf\n", circle_area(a_radius));
+		} else {
+			printf("Kruznice #1 lezi uvnitr kruznice #2, prekryv: %lf\n", circle_area(a_radius));
+		}
+	} else if(center_distance < radii_sum) {
+		printf("Kruznice se protinaji, prekryv: %lf\n", intersection_area(a_radius, b_radius, center_distance));
+	} else if(center_distance == radii_sum) {
+		printf("Vnejsi dotyk, zadny prekryv.\n");
+	} else {
+		printf("Kruznice lezi vne sebe, zadny prekryv.\n");
+	}
+
+	return EXIT_SUCCESS;
+}