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3 years ago

Check all statements that are true,

Mathematics

1 answer:

miv72 [106K]3 years ago

5 0

4) In spherical geometry, some quadrilaterals are parallelograms.

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What is the length, in units, of segment CD?

leonid [27]

Answer:

The answet is C.

Step-by-step explanation:

First, you have to find the angle of ACB using Sine Rule, sinθ = opposite/hypotenuse :

$\sin(θ ) = \frac{oppo.}{hypo.}$

$let \: oppo. = 4 \\ let \: hypo. = 5$

$\sin(θ) = \frac{4}{5}$

$θ = {\sin( \frac{4}{5} ) }^{ - 1}$

$θ = 53.1 \: (1d.p)$

Given that line AB is parallel to line CD so ∠C = 90°. Next, you have to find the angle of ACD :

$ACD = 90 - 53.1 = 36.9$

Lastly, you can find the length of CD using Cosine rule, cosθ = adjacent/hypotenuse :

$\cos(θ) = \frac{adj.}{hypo.}$

$let \: θ = 36.9 \\ let \: adj. = 5 \\ let \: hypo. = CD$

$\cos(36.9 ) = \frac{5}{CD}$

$CD \cos(36.9) = 5$

$CD = \frac{5}{ \cos(36.9) }$

$CD = 6.25 units\: (3s.f)$

4 0

3 years ago

The placebo effect is an example of a(n) experimenter bias. participant bias. random assignment bias. random selection bias.

densk [106]

Answer:

participant bias

Step-by-step explanation:

Participant bias is sometimes called as subject bias. it is referred to as the tendency of a subject that forces them to act in an experiment. it is held because that they think researchers is looking up to them to act. it occurs only when the subject has detail knowledge about the study or project.

Participant bias is a subject initiative to know about the inner thought of the researcher so the subject acts according to what the researcher wants to hear.

4 0

3 years ago

What is y to the power of x

DedPeter [7]

X would be the exponent and y would be the number

4 0

3 years ago

The sum of j and 47 is 55

Gnom [1K]

J + 47 = 55
j = 8

8 is the missing number.

6 0

3 years ago

Please help. What are the answers?

Aneli [31]

Answer: A is the answer

Step-by-step explanation:

3 0

3 years ago