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Hatshy [7]
3 years ago
13

In a pair of complementary angles, the measurement of the larger angle is three times that of the smaller angle. Find the measur

ements of the two angles.
Mathematics
2 answers:
Setler [38]3 years ago
7 0
So the meaning of two angles being complimentary simply means that the two angles add up to 90 degrees. Lets call the two angles x and y where x is the smaller angle.
x + y = 90
We also know that y, being the larger angle is 3 times x.
y = 3*x
Given these two we can solve the problem with basic algebra!
x + y =90
x + (3*x) = 90
4*x = 90
x = 90/4
x = 22.5
y = 3 * x
y = 3*(22.5)
y = 67.5
IgorC [24]3 years ago
5 0

Answer:

Angle L*; 67.5 degrees

Angle S*; 22.5 degrees

Step-by-step explanation:

Angle L is 3 times bigger than Angle S.

With this information, we can make an equation.

L=3S

Complementary angles add up to 90 degrees.

90 = 3S + S

90 = 4S

22.5

Angle S equals 22.5.

Because Angle L is 3 times bigger than Angle S, we multiply 22.5 by 3.

This gives us 67.5.

Angle L is 67.5 degrees

Angle S is 22.5 degrees

Now, in order to check our work, we add the two angles together.

67.5 + 22.5 = 90

Because they add up to 90 degrees, the complementary angles work with each other meaning that we are correct

*Angle L is the larger angle

**Angle S is the smaller angle

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3 years ago
An evergreen tree is supported by a wire extending from 1.5 feet below the top of the tree to a stake in the ground. The wire is
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Answer:

Approximately 21.9\; \rm ft (assumption: this tree is perpendicular to the ground.)

Step-by-step explanation:

Refer to the diagram attached (not drawn to scale.)

Label the following points:

  • \rm S: stake in the ground.
  • \rm A: top of the tree.
  • \rm B: point where the wire is connected to the tree.
  • \rm C: point where the tree meets the ground.

Segment \rm SB would then denote the wire between the tree and the stake. The question states that the length of this segment would be 24\; \rm ft. Segment \rm AB would represent the 1.5\; \rm ft between the top of this tree and the point where the wire was connected to the tree.

The question is asking for the height of this tree. That would correspond to the length of segment \rm AC.

If this tree is perpendicular to the ground, then \rm \angle A\hat{C}S =90^\circ. Triangle \rm \triangle BCS would be a right triangle with segment \rm SB as the hypotenuse.

The question states that the angle between the wire (segment \rm SB) and the ground (line \rm SC) is 58^\circ. Therefore, \rm \angle A\hat{S}C = 58^\circ.

Notice, that in right triangle \rm \triangle BCS, segment \rm BC is the side opposite to the angle \rm \angle B\hat{S}C = 58^\circ. Therefore, the length of segment \rm BC\! could be found from the length of the hypotenuse (segment \rm SB) and the cosine of angle \rm \angle B\hat{S}C = 58^\circ\!.

\displaystyle \cos\left(\rm \angle B\hat{S}C\right) = \frac{\text{length of $\mathrm{BC}$}}{\text{length of $\mathrm{SB}$}} \quad \genfrac{}{}{0em}{}{\leftarrow\text{opposite}}{\leftarrow \text{hypotenuse}}.

Rearrange to obtain:

\begin{aligned}& \text{length of $\mathrm{BC}$} \\ &= (\text{length of $\mathrm{SB}$}) \cdot \cos\left(\angle \mathrm{B\hat{S}C}\right)\\ &= \left(24\; \rm ft\right) \cdot \cos\left(58^\circ\right) \approx 20.35\; \rm ft\end{aligned}.

In other words, the wire is connected to the tree at approximately 20.3\; \rm ft above the ground.

Combine that with the length of segment \rm AB to find the height of the entire tree:

\begin{aligned}&\text{height of the tree} \\ &= \text{length of $\mathrm{AC}$} \\ &= \text{length of $\mathrm{AB}$} + \text{length of $\mathrm{BC}$}\\ &\approx 20.35\; \rm ft + 1.5\; \rm ft \\ &\approx 21.9\; \rm ft\end{aligned}.

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3 years ago
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