(PLEASE HELP FAST!!!) Which expression gives the area of triangle QRS?
1 answer:
The expression which gives the area of triangle QRS is .
We need to find the area of triangle QRS.
<h3>How do I find the area of a triangle using trigonometry?</h3>The area of a triangle can be expressed using the lengths of two sides and the sine of the included angle. Area of Δ = ½ ab sin C.
Now, the area of the triangle QRS
Therefore, the expression which gives the area of triangle QRS is .
To learn more about the area of a triangle using trigonometric ratios visit:
brainly.com/question/18659560.
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Given:
One airplane is at 7,000 feet and is descending 50 feet every second.
Another plane is at 1,000 feet and is climbing at a rate of 70 feet per second.
To find:
The time taken by planes to reach at the same height.
Solution:
Let x be the number of seconds after which the planes be at the same height.
One airplane is at 7,000 feet and is descending 50 feet every second.
Change in 1 second = -50 feet (Here negative sign means decrease)
Change in x second = -50x feet
Height of first airplane after x seconds is
...(i)
Another plane is at 1,000 feet and is climbing at a rate of 70 feet per second.
Change in 1 second = 70 feet
Change in x second = 70x feet
Height of first airplane after x seconds is
...(ii)
Equate (i) and (ii), to find the time after which both planes are on the same height.
Divide both sides by 120.
Therefore, both planes are at the same height after 50 seconds.
Answer:
41.68 or 42 (rounded)
Step-by-step explanation:
Presuming you are working on right triangles, you can use the Soh Cah Toa theorems.
Because angle A = 21 and side a = 16 you can use Toa or
Plugged into a calculator, you get 41.68 and some change.
If this is NOT a right triangle question, please let me know so that I can revise my answer.