The equivalent expression to given expression is 1/3.
<h3>What is Equivalent Expression?</h3>
Equivalent expressions are defined as algebraic expressions which give the same resulting expression. An algebraic expression (or) a variable expression is defined as a combination of terms by the operations such as addition, subtraction, multiplication, division.
Here, given expression

= 
= 
= 1/3
Thus, the equivalent expression to given expression is 1/3.
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Answer:
90°
Step-by-step explanation:
90
Thales Theorem
Answer:
B
Step-by-step explanation:
I think it is No am not sure exactly
Cosine(angle) = adjacent leg/ hypotenuse
Cosine( angle ) = 18/20
Angle = arccos(18/20)
Angle = 26 degrees