PYTHON CS problem, please help me with this question also can you help me with the indent i have problem with it

Problem 4 A Bookmark this page Problem 4 10.0 points possible (graded) Write a function is_triangular that meets the specification below. A triangular number is a number obtained by the continued summation of integers starting from 1. For example, 1, 1+2, 1-2-3, 1+2-3+4, etc., corresponding to 1, 3, 6, 10, etc., are triangular numbers. def is_triangular(k): k, a positive integer returns True if k is triangular and False if not #YOUR CODE HERE Paste your entire function, including the definition, in the box below. Do not leave any debugging print statements. 1# Paste your function here Press ESC then TAB or click outside of the code editor to exit Unanswered