The actual height of lighthouse is 154 feet.
Step-by-step explanation:
Given,
Length of scale drawing =
Scale used in drawing;
5 inches = 80 feet
1 inch =
The actual height of lighthouse is 154 feet.
Keywords: unit rate, multiplication
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Solve for n by simplifying both sides of the equation, then isolating the variable.
N = -15
The solution to the question is:
c is 6 =
b is 5 =
cosB is 2 =
a is 4 =
cosA is 3 =
cosC is 1 =
<h3>What is cosine rule?</h3>
it is used to relate the three sides of a triangle with the angle facing one of its sides.
The square of the side facing the included angle is equal to the some of the squares of the other sides and the product of twice the other two sides and the cosine of the included angle.
Analysis:
If c is the side facing the included angle C, then
= + -2ab cos C-----------------1
then c =
if b is the side facing the included angle B, then
= + -2accosB-----------------2
b =
from equation 2, make cosB the subject of equation
2ac cosB = + -
cosB =
if a is the side facing the included angle A, then
= + -2bccosA--------------------3
a =
from equation 3, making cosA subject of the equation
2bcosA = + -
cosA =
from equation 1, making cos C the subject
2abcosC = + -
cos C =
In conclusion,
c is 6 =
b is 5 =
cosB is 2 =
a is 4 =
cosA is 3 =
cosC is 1 =
Learn more about cosine rule: brainly.com/question/4372174
$SPJ1
Area of the room = 12 * 15.5 = 186 square feet
This equals 186 / 9 = 20 2/3 square yards
So you have not got enough capet tiles to do the job.
You need another 1 carpet tile to finiush the job.