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3 years ago

Which equation is correct regarding the diagram of circle O?

Mathematics

1 answer:

4vir4ik [10]3 years ago

5 0

Answer:m∠XZY = (a – b)

Step-by-step explanation:just took the test and got it right

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A rectangle has a width of 7.9 feet and a perimeter of 27.2 feet enter the length of the rectangle in decimal form

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3 years ago

Help me with this plz..........

kodGreya [7K]

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4 years ago

A cylinder has a radius of

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4 years ago

Geometry . Cosines / sines. Find a and round to the nearest 10th

Lorico [155]

This is the good part of Trigonometry, actually measuring triangles. It's much better than all the identities around sine and cosine and the rest, which actually have more to do with circles than triangles.

This part of trig has a short menu:

Law of Cosines. Three ways to write it, one is $c^2 =a^2+b^2-2ab \cos C$

Law of Sines: $\dfrac{a}{\sin A} = \dfrac{b}{\sin B} = \dfrac{c}{\sin C}$

Triangle angles: $A+B+C=180^\circ$

and two special cases of the Law of Cosines, the Pythagorean Theorem

$C=90^\circ, \quad \quad c^2=a^2+b^2$

and the Collinear Points Theorem:

$C=180^\circ, \quad \quad c^2=a^2+b^2 - 2 a b \cos 180^\circ = a^2+b^2+2ab=(a+b)^2$

$c = a+b$

Here we choose Triangle Angles followed by Law of Sines:

A = 180 - 105 -15 = 60 degrees

$\dfrac{a}{\sin 60^\circ}= \dfrac{2}{\sin 105^\circ}$

$a= \dfrac{2 \sin 60^\circ}{\sin 105^\circ} = 1.793...$

Answer: 1.8 cm

When I was a student we'd be expected to get $\sin 105^\circ$ exactly and get

$a = 3 \sqrt{2} - \sqrt 6$

But that was before online homework.

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3 years ago

4. Lincoln began his speech, “Four score and seven years ago....” How many years is four score and seven? (Hint: A score is 20 y

chubhunter [2.5K]

87 years I think…. If a score is 20 years and four scores have passed you do 4x20 = 80. 80 plus the seven 80+7 = 87

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3 years ago

Which equation is correct regarding the diagram of circle O?​

Which equation is correct regarding the diagram of circle O?