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MakcuM [25]
3 years ago
7

What is the exact value of cos 225º cos 75°?

Mathematics
2 answers:
love history [14]3 years ago
5 0

Answer:

-\frac{\sqrt{3}  -1}{4}

Step-by-step explanation:

julsineya [31]3 years ago
3 0

Answer:

√

6

−

2

4

Step-by-step explanation:

i dont kno the other one

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The shortest living domestic cat measures 133.4 millimeters. How many centimeters tall is the cat?
Westkost [7]

Answer:

he/she is 13.34 centimeters tall

Step-by-step explanation:

m you simply slide the decimal over one space to the left in order to convert from millimeters to centimeters. Have an Awesome day and hope i could help!    :)

6 0
3 years ago
Pls help
KATRIN_1 [288]

Answer:

169.04 in² (nearest hundredth)

Step-by-step explanation:

Surface area of a cone = \pir² + \pirl

(where r = radius of the base and l = slant height)

Given slant height l = 10 and surface area = 188.5

Surface area  = \pir² + \pirl

188.5 = \pir² + 10\pir

\pir² + 10\pir - 188.5 = 0

r = \frac{-10\pi +\sqrt{(10\pi )^2-(4\times\pi \times-188.5)} }{2\pi } = 4.219621117...

Volume of a cone = (1/3)\pir²h

(where r = radius of the base and h = height)

We need to find an expression for h in terms of l using Pythagoras' Theorem a² + b² = c², where a = radius, b = height and c = slant height

r² + h² = l²

h² = l² - r²

h = √(l² - r²)

Therefore, substituting found expression for h:

volume of a cone = (1/3)\pir²√(l² - r²)

Given slant height l = 10 and r = 4.219621117...

volume = 169.0431969... = 169.04 in² (nearest hundredth)

5 0
3 years ago
Read 2 more answers
Marcus drew a line from point Y to point W in the rectangle shown below. He created two identical triangles. Classfy the triangl
VikaD [51]
The triangles that would be created if the rectangle has a length and width that are different is a right scalene triangle.

It will have one right angle and all three sides of the triangle will be different lengths because the hypotenuse (the diagonal will be longer than the other two sides.
6 0
4 years ago
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fenix001 [56]

Answer:

a

Step-by-step explanation:

4 0
3 years ago
A plane flying horizontally at an altitude of 3 mi and a speed of 440 mi/h passes directly over a radar station. find the rate a
Amiraneli [1.4K]
Let α represent the acute angle between the horizontal and the straight line from the plane to the station. If the 4-mile measure is the straight-line distance from the plane to the station, then
  sin(α) = 3/4
and
  cos(α) = √(1 - (3/4)²) = (√7)/4

The distance from the station to the plane is increasing at a rate that is the plane's speed multiplied by the cosine of the angle α. Hence the plane–station distance is increasing at the rate of
  (440 mph)×(√7)/4 ≈ 291 mph
8 0
3 years ago
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