Can someone explain to my why sin(90)=1

Is fgh ~ jkl? if so, identify the similarity postulate or theorem that applies.

Asquare parking lot has 6,400 square meters what is the length in meters

Astandard american eskimo dog has a mean weight of 30 pounds with a standard deviation of 2 pounds. assuming the weights of standard eskimo dogs are normally distributed, what range of weights would 99.7% of the dogs have? approximately 26–34 pounds approximately 24–36 pounds approximately 28–32 pounds approximately 29–31 pounds