Answer:
Explanation:
the little triangle is 1/3 of the big one. we know that b/c of the 6/18 sides and that's also 1/3, I mean the fraction 6/18 , reduces to 1/3
so we know that 1/3 of the 42 is the small triangle and that 2/3 of 42 is the rest of that distance, so
42 * 2/3 = ?
28 = ?
so that part that they want to know is 28 units... :)