B. All rectangles are parallelograms. <span />
Answer: A blending problem
Step-by-step explanation:
A blending problem also called mixing ingredients where to obtain a product with certain properties. Blending problem determining the optimum amounts of ingredients to include in a feed mix.
If О is the center of a circle then:
<span>
OA = OB = OC = OD [radii]
AB = AH + HB = 15 + 15 = 30 </span>⇒ AB = CD
<span>
So </span>ΔAOB ≅ ΔCOD [SSS rule] ⇒ x = OH = 16 units.