I need help on this math problem!

Answer: 20 inches
Step-by-step explanation:
The problem is having you solve for the hypotenuse of a right triangle so you'll use the pythagorean theorem.
12²+16²=400.
√400= 20
20 inches.
Hope this helps!
Answer:
20 inches
Explanation:
Imagine the two sides to be the length and width of a triangle, and the line he drew as the hypotenuse. Thus, we can use the Pythagorean theorem:
c² = a² + b²
c² = 12² + 16²
c² = 144 + 256
c² = 400
c = 20 in.