Answer:
3/7
Step-by-step explanation:
Sin (R) = opposite ÷ hypotenuse,
Find the opposite by using pythagorean theorem.
(AY)^2 + (2√10)^2 = 7^2
(AY)^2 + 40 = 49
(AY)^2 = 9
AY = 3
Sin(R) = 3/7
