Find m<1 . Then classify the triangle by its angles.
1
30°
40°
m<21
70.

If you make it a little more clear i can answer it

It’s d for sure i just did also that’s why

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.