What a fantastic maths question!

You know how we have a big clock face with numbers on it? Well, in maths, there are something called "degrees" that help us measure angles.

An equilateral triangle is a special kind of triangle where all three sides are equal and all three corners are the same. Imagine you're holding a ruler, and you draw a big triangle with all its sides being the same length. That's an equilateral triangle!

Now, when we look at one corner of this triangle, it's like a "window" to the rest of the triangle. And if we think about how many degrees are in that corner, we can use a simple trick.

Have you ever heard of a clock face? It has 12 numbers on it, right? Well, if we add up all the numbers around the clock face (1+2+3+4+5+6+7+8+9+10+11+12), we get... 78! And that's because each number is 30 degrees apart.

So, when we look at our equilateral triangle, one corner is like a "window" to the rest of the clock face. Since there are 360 degrees in a full circle (that's why we have a whole year!), and if we divide 360 by 12 (the numbers on the clock face), we get... 30!

That means each corner of an equilateral triangle has... 60 degrees! Isn't that cool?