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STALIN [3.7K]
3 years ago
5

Full steps and all reasons, thanks!​

Mathematics
1 answer:
Nataly_w [17]3 years ago
8 0

You can focus on the two sub-triangles ABC and ACD

We know that they are both right triangles, because we're given that AC and BD are perpendicular.

The sides AB and AD are the hypothenuses of these triangles, so we know their length through the pythagorean theorem:

AD^2 = AC^2+CD^2

AB^2 = AC^2+BC^2

But since we're given BC=CD, the expressions for AD and AB are actually the same expression. This proves that AD=AB, and thus that the triangle is isosceles.

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Which is a irrational number, √39, √9, √49, 1.7
stiv31 [10]

Answer:

√39

Step-by-step explanation:

An irrational number is a number that cannot be expressed by a fraction.

√9 = 3

√49 = 7

All whole numbers can be expressed as fractions and are <u>not</u> irrational numbers.

1.7 = 17/10 which is <u>not</u> an irrational number.

7 0
3 years ago
A jewelry store bought a gold necklace and marked it up 110% from the original cost of $23.52. Later on, Dean purchased the gold
gladu [14]

Answer: The Solution is in the photo

4 0
3 years ago
Using this formula, how many sides does a polygon have if the sum of the interior angles is 1,260°? Round to the nearest whole n
nikdorinn [45]

Answer:

9 Sides

Step-by-step explanation:

According to the Question,

  • Given That, The sum of the interior angles(s), in an n-sided polygon can be determined using the formula s=180(n−2), where n is the number of sides

Therefore, The sides do a polygon have if the sum of the interior angles is 1,260°.

Put The Values in Formula, we get

1260=180(n−2)

n-2 = 7

n=9 (9 Sides)  

6 0
2 years ago
over the past ten years, the town's population doubled in size. the population is currently 12,000. what was the population ten
IceJOKER [234]
The population ten years ago was 6,000.

Because the population doubled you divide 12,000 by 2

12,000 / 2 = 6,000
8 0
3 years ago
Read 2 more answers
How can you check your work when you are finding arc measures?
Murrr4er [49]

After you measured it you can check if the measurement is correct by knowing radius and arc length using formula,

\alpha=\dfrac{l}{r}.

Hope this helps.

6 0
3 years ago
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