Answer:
Option A. 
Step-by-step explanation:
we know that
To find the diagonal of the rectangle apply the Pythagoras Theorem
Let
D-----> the diagonal of rectangle
L----> the length of rectangle
W---> the width of rectangle
so

substitute the values



A LEVER
Its a lever because both sides can be controlled by eachother :)
Answer:
68°
Step-by-step explanation:
As BA⊥BD, so ∠ABD = 90°
also, ∠ABD = ∠CBD + ∠ABC
⇒ 90° = 4x + 52° + 8x - 10°
⇒ 12x = 48°
⇒ x = 4°
now,
∠CBD = 4x + 52°
= 4(4°) + 52°
= 68°
https://photomath.net/s/6O312e
^ that link will show you step by step and explain it, rather than writing a whole paragraph, Hope that helps:)