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Vikki [24]
3 years ago
11

Brilliant question!!!!

Mathematics
2 answers:
avanturin [10]3 years ago
6 0

Answer:

a) 21

b) 78.5 - 28.3 - 12.57 = 37.63

Step-by-step explanation:

For the triangle, you want to use the formula 1/2 base times height and then subtract 2 time 2. For the circle, the formula is pi times the radius squared. Then, subtract the other circles using the same formula. I hope this helps! Please mark me brainliest because I have been scammed many times. Please and thank you.

zvonat [6]3 years ago
5 0

Answer:

(a) 21 m squared

(b) 12π cm squared

Step-by-step explanation:

(a) Notice that in order to find the shaded area, we simply need to subtract the little square area from the big triangle's area.

The area of a triangle is: A = (1/2) * b * h, and here, b = 5 and h = 10. So, plugging these in, we have:

A = (1/2 ) * b * h

A = (1/2) * 5 * 10 = (1/2) * 50 = 25 m squared.

The area of a square is simply s * s, where s is the side length. Here, the side length is 2, so s = 2. Plugging this in, we get:

A = s * s

A = 2 * 2 = 4 m squared.

We subtract 4 from 25: 25 - 4 = 21 m squared.

(b) To find the area of the shaded region, we must find the total, big circle area and subtract both small circles' areas from it.

The area of a circle is denoted by: A = \pi r^2, where r is the radius.

The second-smallest circle has a radius of 3, so r = 3. Plug this in:

A = \pi r^2

A = \pi *3^2=9\pi cm squared

The smallest circle has a radius of 2, so r = 2. Plug this in:

A = \pi r^2

A = \pi *2^2=4\pi cm squared

Notice that the sum of the diameters of the two small circles add up to the diameter of the big circle. The diameters of the two small circles are 3 * 2 = 6 and 2 * 2 = 4, so adding them together, we see that the big circle's diameter is 6 + 4 = 10. Since radius is half of diameter, the radius of the big circle is 10/2 = 5, so r = 5. Plug this in:

A = \pi r^2

A = \pi *5^2=25\pi cm squared.

Now subtract each of the small circles' areas from this:

25\pi -9\pi -4\pi =12\pi

Thus, the shaded area is 12π cm squared.

Hope this helps!

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Johnny says multiplication always makes numbers bigger. Explain to Johnny why this isn’t true. Give more than one example to hel
yarga [219]

Answer:

Explained

Step-by-step explanation:

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6 0
3 years ago
Question 2
fomenos

Answer:

D. (-2,-5), (0, -7), (1, -4)

Step-by-step explanation:

From Function Theory we must remember that range of a function is the set of images related to elements of the domain. In this case, we must find the image of each of the three elements that forms the domain of f(x, y) = (y+2, -x-4), which are: A(x,y) = (1, -4), B(x,y) = (3,-2) and C(x,y) = (0,-1).

Then we proceed to find all elements of range:

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C(x,y) = (0,-1)

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f(0,-1) = (1,-4)

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3 years ago
Select the three ratios that are equivalent to 3 boys/5 girls.
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6 0
3 years ago
Read 2 more answers
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vitfil [10]
SinA=5root3/10
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3 years ago
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