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Nuetrik [128]
2 years ago
13

Can someone help me on this?

Mathematics
1 answer:
Mnenie [13.5K]2 years ago
5 0

Answer:

Step-by-step explanation:

We know that cosx = sin(\pi - x)

We can apply it here:

sin(55°) = cosx

cos(\pi - 55°) = cosx

Now we apply the arccos to both sides:

x = \pi - 55° + 2k\pi or x = -\pi - 55° + 2k\pi

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I’m lost please help
vagabundo [1.1K]

Answer:

See proof below

Step-by-step explanation:

Two triangles are said to be congruent if one of the 4 following rules is valid

  1. The three sides are equal
  2. The three angles are equal
  3. Two angles are the same and a corresponding side is the same
  4. Two sides are equal and the angle between the two sides is equal

Let's consider the two triangles ΔABC and ΔAED.

ΔABC sides are AB, BC and AC

ΔAED sides are AD, AE and ED

We have AE = AC and EB = CD

So AE + EB = AC + CD

But AE + EB = AB and AC+CD = AD

We have

AB of ΔABC  = AD of ΔAED

AC of ΔABC =  AE of ΔAED

Thus two sides the these two triangles. In order to prove that the triangles are congruent by rule 4, we have to prove that the angle between the sides is also equal. We see that the common angle is ∡BAC = ∡EAC

So  triangles ΔABC and ΔAED are congruent

That means all 3 sides of these triangles are equal as well as all the angles

Since BC is the third side of ΔABC and ED the third side of ΔAED, it follows that

BC = ED  Proved

5 0
1 year ago
Help!!! PLEASE!!!
kirza4 [7]

Answer:

Le and nos

Step-by-step explanation:

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It is a rational number because it can be expressed by a quotation or fraction of an integer
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