50 POINTS !!
PLEASE HELP !! ILL GIVE BRAINLIEST TO THE RIGHT ANSWERS.

Answer:
20
Step-by-step explanation:
a²+b² = c²
16²+12² = 400²
20 millimetres
Step-by-step explanation:
12 square plus 16 square is 144 plus 256. 400 is the hypotenuse square. 400 by a square root will be equal to 20 millimeters.