It’s 6=6 I think I hope it’s help have a nice day
so you are going to use the Pythagorean theorem on the smaller triangle to find the connecting side's length

now you can find the bigger triangle's hypotenuse

c=4
16 rounded to the nearest number is 20 im not sure if i helped you though
Answer:
number 2 is SSS
Step-by-step explanation:
Note: complementary angles are two angles whose sum is 90⁰