#include <stdio.h>

int main() {
    float a, b, c;
    float a2, b2, c2;

    printf("Introduce los tres lados del triangulo: ");
    scanf("%f %f %f", &a, &b, &c);
    a2 = a * a;
    b2 = b * b;
    c2 = c * c;

    if (a2 == b2 + c2 || b2 == a2 + c2 || c2 == a2 + b2) {
        printf("\nEl triangulo es RECTANGULO.\n");
    } 
    else if (a2 > b2 + c2 || b2 > a2 + c2 || c2 > a2 + b2) {
        printf("\nEl triangulo es OBTUSANGULO.\n");
    } 
    else {
        printf("\nEl triangulo es ACUTANGULO.\n");
    }

    return 0;
}

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