Similar Triangles Proof: Analyzing ΔACB∼ΔBED with 30° and 60° Angles

AAABBBCCCDDDEEE60°30°30°60°ΔACBΔBED ΔACB∼ΔBED

Choose the correct answer.

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Choose the correct answer
00:03 Find the side opposite to the 30-degree angle in both triangles
00:14 Use the same method for the 90-degree angle in both triangles
00:23 And the same for the 60-degree angle in both triangles
00:33 The similarity ratio is always the side opposite to the equal angle
00:53 Let's use the transition rule
00:57 And this is the solution to the question

Step-by-step written solution

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1

Understand the problem

AAABBBCCCDDDEEE60°30°30°60°ΔACBΔBED ΔACB∼ΔBED

Choose the correct answer.

2

Step-by-step solution

First, let's look at angles C and E, which are equal to 30 degrees.

Angle C is opposite side AB and angle E is opposite side BD.

ABDB \frac{AB}{DB}

Now let's look at angle B, which is equal to 90 degrees in both triangles.

In triangle ABC the opposite side is AC and in triangle EBD the opposite side is ED.

ACED \frac{AC}{ED}

Let's look at angles A and D, which are equal to 60 degrees.

Angle A is the opposite side of CB, angle D is the opposite side of EB

CBEB \frac{CB}{EB}

Therefore, from this it can be deduced that:

ABBD=ACED \frac{AB}{BD}=\frac{AC}{ED}

And also:

CBED=ABBD \frac{CB}{ED}=\frac{AB}{BD}

3

Final Answer

Answers a + b are correct.

Practice Quiz

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Is the similarity ratio between the three triangles equal to one?

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