Hi there! The answer is 3 multiplied by the square root of 13.
Using the following theorem (Pythagorean Theorem), with a and b representing rectangular sides and c representing the hypotenuse, and the numbers from the picture, we get the following:
Fill in the numbers
Work out the powers
Add up
Take the square root of both sides.
answer is 200 lol pretty easy
The statement is false because not all shapes that have 3 sides are polygons, theres many shapes that have three sides, and they aren't triangles :/