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Serjik [45]
4 years ago
13

What is the measure of angle A?

Mathematics
1 answer:
NikAS [45]4 years ago
3 0

Answer:

78

Step-by-step explanation:

in a quadrilateral that's inscribed in a circle, opposite angles are supplementary.

102+78=180

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What is the area of triangle ABC in the image below.
love history [14]

Answer:

B) 31.5

Step-by-step explanation:

Base*height/2

3 0
3 years ago
Verify the following identity. <br><br> <img src="https://tex.z-dn.net/?f=-%5Cfrac%7Bcos%283x%29%2Bcos%285x%29%7D%7Bsin%283x%29-
kogti [31]

Recall the angle sum identities:

cos(a + b) = cos(a) cos(b) - sin(a) sin(b)

cos(a - b) = cos(a) cos(b) + sin(a) sin(b)

sin(a + b) = sin(a) cos(b) + sin(b) cos(a)

sin(a - b) = sin(a) cos(b) - sin(b) cos(a)

Notice that adding the first two together, and subtract the last from the third, we get two more identities:

cos(a + b) + cos(a - b) = 2 cos(a) cos(b)

sin(a + b) + sin(a - b) = 2 sin(b) cos(a)

Let a = 4x and b = x. Then

cos(5x) + cos(3x) = 2 cos(4x) cos(x)

sin(5x) - sin(3x) = 2 sin(x) cos(4x)

Now,

-\dfrac{\cos(3x)+\cos(5x)}{\sin(3x)-\sin(5x)}=\dfrac{\cos(5x)+\cos(3x)}{\sin(5x)-\sin(3x)}=\dfrac{2\cos(4x)\cos x}{2\sin x\cos(4x)}=\dfrac{\cos x}{\sin x}=\cot x

as required.

4 0
4 years ago
The design is rotated about the line x=1 to produce the shape of the urn. Finish the potter's design by drawing a picture
VLD [36.1K]

Answer:

I am on this same question and have no idea

Step-by-step explanation:

5 0
3 years ago
6x + 2y = 2 and 3x + y =1 solve by elimination
inna [77]

Answer:

Point form : (x,1-3x)

Equation form : x=x , y=1-3x

Step-by-step explanation: Add the equations in order to solve for the first variable. Plug this value into the other equations in order to solve for the remaining variables.

Hope this helps you out! If you need anymore help with math, let me know and I will be more than happy to help you! ☺

-Karleif Jonsi-

8 0
3 years ago
Read 2 more answers
Please solve with explanation
Bas_tet [7]

Answer:

I don't know

Explanation:

Sorry :(

4 0
3 years ago
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