import random


def monte_carlo(trials, shape):
    count = 0

    for i in range(trials):
        x = random.random()
        y = random.random()

        if shape(x, y):
            count += 1

    return count / trials


def in_triangle(x, y):
    return x + y < 1 # y < 1 - x


def in_circle(x, y):
    return x ** 2 + y ** 2 < 1