Recall the half-angle identity:
So in order to find
, we only need to know the value of
. But there are two possible values. To decide which to take, we use the given information: we know that
lies in quadrant III, which means
, so
, which places
in quadrant II. In this quadrant, the sine of angle is positive, and so
is an angle of a ray whose terminal point,
lies on the circle
. The
-coordinate is all we need to know in order to find that
. So,
We know that the commercial plane travels 570 miles/hour. To find out how many miles does the plane travel, we do:
570 × 7 = 3990 miles.
Therefore, the plane travel 3990 miles.
Answer:
5 times the square root of 2 or 7.071
Step-by-step explanation:
Hope it helps!
Answer:
HCF of 60 and 80 is 20.
Step-by-step explanation:
Answer:
X-16 the first one
Step-by-step explanation:
The first one is equal to x-4
