Answer:
12.
Step-by-step explanation:

Substitute this equation with a=3 and b=24:



The answer is 15
these chords are congruent because the radius of the circle are perpendicular to the them
so we can find EF by making an equation:

so EF is = 3(15)+5=50
good luck
Answer:



Step-by-step explanation:
Given
See attachment
Required
Find b, c and d
First, we solve for b using:
--- base angles of a parallelogram
Collect like terms


Solve for b


Then, we have:

--- opposite angles
So, we have:



