### Home > PC > Chapter 1 > Lesson 1.3.1 > Problem 1-105

1-105.

Use the Pythagorean Theorem.*n*² + *n*² = *d*²

Solve for *d*.

What do you know about the interior angles of squares?

The base is cut into two equal parts by *k*.

Use the Pythagorean Theorem to write an equation and solve for *k*.

What do you know about the interior angles of an equilateral triangle?