Answer:
option a is correct.
Step-by-step explanation:
We have given the equation:
Squaring both sides of the above equation we get:
After simplifying the first step
After final simplification we get:
We are getting quadratic equation since, the degree in resultant is 2.
Therefore, option a is correct.
Given:
Angle A = 18.6°
Angle B = 93°
Length of side AB = 646 meters
To find:
the distance across the river, distance between BC
Steps:
Since we know the measure of 2 angles of a triangle we can find the measure of the third angle.
18.6° + 93° + ∠C = 180°
111.6° + ∠C = 180°
∠C = 180° - 111.6°
∠C = 68.4°
Therefore the measure of angle C is 68.4°.
now we can use the law of Sines,
meters
Therefore, the distance across the river is 222 meters.
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