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DochEvi [55]
3 years ago
5

Help leave in simplest radical form

Mathematics
1 answer:
BabaBlast [244]3 years ago
4 0

Answer:

√23 is the answer of the question

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to estimate the height of the jin mao tower in shanghai , a tourist sights the top of the tower form a mirror that is 86.7 meter
Ray Of Light [21]

Answer:

The height of the tower = 420.48 meters

Step-by-step explanation:

For better understanding of the solution, see the figure attached below :

Let the height of the tower be x meters

Now, using the laws of reflection : angle of reflection = angle of incidence

Also, both the tower and the tourist are standing parallel to each other

⇒ ∠A = ∠i ( Alternate interior angles are equal)

Similarly, ∠D = ∠r ( Alternate interior angles)

But, ∠i = ∠r

⇒ ∠A = ∠D

Also, the tourist and the tower is perpendicular to the ground surface.

⇒ m∠B = m∠E = 90°

Now, in ΔABC and ΔDEC

∠A = ∠D (Proved above)

m∠B = m∠E = 90°

So, by AA postulate of similarity of triangles, ΔABC ~ ΔDEC

As the sides of similar triangles are proportional to each other

\frac{AB}{DE}=\frac{BC}{EC}\\\\\implies\frac{1.92}{x}=\frac{0.4}{87.6}\\\\\implies x=\frac{87.6\times 1.92}{0.4}\\\\\bf\implies x = 420.48\textbf{ meters}

Hence, The height of the tower = 420.48 meters

5 0
3 years ago
What is the y-coordinate of the solution of the system of equations? {y=3x−26 2x−y=19 Enter your answer in the box.
MArishka [77]

Answer:

The y-coordinate of the solution is -5.

Step-by-step explanation:

I graphed the equations on the graph below to find the solution of the system.

If this answer is correct, please make me Brainliest!

8 0
3 years ago
Please I need help on these, dosent need to be right.
Pie

Answer:

Plug in the numbers in the table to find the pattern.

Step-by-step explanation:

3 0
3 years ago
A rectangle has a base of 5 cm and a height of (x + 2)cm. Its area is 20 cm ^ 2. What is the value of x?
Len [333]
So area is base x height:
5(x+2)=20
5x+10=20
5x=10
x=2
its A
3 0
3 years ago
Help I will be marking brainliest!!<br><br> A. 55.33<br> B. 156.16<br> C. 72<br> D. 61.16
Lena [83]

Answer:

the answer is a

Step-by-step explanation:

if you compare pm and qn pm is shorter so you see its only a little bit longer then that so its close to there.

3 0
3 years ago
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