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lisabon 2012 [21]
3 years ago
9

The angle looking up at the sun is 70°. A flagpole casts a shadow of 15 ft. Draw a diagram and find the height of the flagpole

Mathematics
2 answers:
zhenek [66]3 years ago
5 0

Answer:

Option A is correct

the height of the flagpole is, 41.2 ft

Step-by-step explanation:

As per the statement:

The angle looking up at the sun is 70°

⇒\theta= 70^{\circ}

It is also given that:

A flagpole casts a shadow of 15 ft.

For this you can see the diagram as shown below in the attachment.

Now, find the height of the flagpole.

Let h be the height of flagpole.

using tangent ratio:

\tan \theta = \frac{\text{Opposite side}}{\text{Adjacent side}}

From the given diagram;

\theta = 70^{\circ}

Opposite side = Height of the Flag pole = h

Adjacent  side = Shadow of the flagpole = 15 ft

Substitute these we get;

\tan 70^{\circ} = \frac{h}{15}

Multiply both sides by 15 we get;

15 \cdot \tan 70^{\circ} = h

15 \cdot 2.75 = h

Simplify:

41.2 ft = h

or

h = 41.2 ft

Therefore, the height of the flagpole is, 41.2 ft

deff fn [24]3 years ago
4 0

Answer:

The length of the flagpole be 41.2 ft .

Option (A) is correct .

Step-by-step explanation:

As given

The angle looking up at the sun is 70°.

A flagpole casts a shadow of 15 ft .

Now by using the trignometric identity .

tan \theta = \frac{Perpendicular}{Base}

\ theta = 70^{\circ}

tan\ 70^{\circ} = \frac{AB}{BC}

BC = 15 ft

tan 70° = 2.75 (Approx)

2.75 = \frac{AB}{15}

AB = 2.75 × 15

     = 41.2 ft

Therefore the length of the flagpole be 41.2 ft .

Option (A) is correct .

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