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ceibrione1
26.04.2020 •
Mathematics
Anyone who’s good at area please help
So
I need to find the SHADED area
The first one is for A)
The second one is B)
Solved
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Ответ:
(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 =
, where r is the radius.
The second-smallest circle has a radius of 3, so r = 3. Plug this in:
A =![\pi r^2](/tpl/images/0627/8761/8463b.png)
A =
cm squared
The smallest circle has a radius of 2, so r = 2. Plug this in:
A =![\pi r^2](/tpl/images/0627/8761/8463b.png)
A =
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](/tpl/images/0627/8761/8463b.png)
A =
cm squared.
Now subtract each of the small circles' areas from this:
Thus, the shaded area is 12π cm squared.
Hope this helps!
Ответ:
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.
Ответ:
A. 5x + 6x = 70 degrees
Step-by-step explanation:
5x + 6x = 110 degrees because the sum of two interior angles in a triangle is equal to an exterior angle.