Use the diagram to complete the statement.

m∠ECF = degrees

36.86989765

Step-by-step explanation:

As Angle GBC = Angle CDF = 45, so CF = CD as it is an isosceles right triangle  , then as sin(45) = 1/root(2), so CF = 12, then tan(angle ECF) = FE/CF = 9/12, then angle ECF = tan^-1 (9/12) = 36.86989765.

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step-by-step explanation:

it's is b

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.