The answer is D Because in a tangent
Answer:
A
Step-by-step explanation:

<em>Golden ratio, also known as the golden section, golden mean, or divine proportion, in mathematics, the irrational number (1 + Square root of√5)/2, often denoted by the Greek letter ϕ or τ, which is approximately equal to 1.618.</em>
Answer:
380
Step-by-step explanation:
640/2=320
320-60=260
640-260=380