I’m really stuck on this circle theorems question, can someone help please

Step-by-step explanation:

O is the center of the circle.  So OD, OC, and OB are all radii of the circle, and therefore congruent.

That means that ΔDCO and ΔCBO are isosceles triangles.  The base angles of isosceles triangles are congruent.  So ∠DCO = x.

ADP and ABQ are tangent to the circle.  Therefore, they are perpendicular to OD and OB.

Since ∠ABO = 90°, ∠CBO = 90° − 2x.  Which means ∠OCB = 90° − 2x.

∠BCD is the sum of ∠DCO and ∠OCB:

∠BCD = x + 90° − 2x

∠BCD = 90° − x

Angles of a triangle add up to 180°.  So:

∠DOC = 180° − x − x = 180° − 2x

∠BOC = 180° − (90° − 2x) − (90° − 2x) = 4x

Central angles add up to 360°.  So ∠DOB is:

∠DOB = 360° − (180° − 2x) − (4x)

∠DOB = 180° − 2x

The interior angles of kite ADOB add up to 360°.

360° = 90° + 90° + (180° − 2x) + y

360° = 360° − 2x + y

y = 2x

from the figure we get,

the x axis shows   the months and,

the y-axis shows the number of satisfied customer.

each line or each cell in upward direction (y-axis) shows 500.

the appropriate scale for the y - axis is: -

a = 2000 customers

b = 4000 customers

c = 6000 customers

d = 8000 customers

e = 10000 customers

f = 12000 customers

g = 14000 customers