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9966 [12]
2 years ago
13

Help, Please! There is a Simicircle with a diameter of 36mm, what is the area? Use 3.14 for pi

Mathematics
1 answer:
kondaur [170]2 years ago
4 0

Answer:

28.258mm

Step-by-step explanation:

A semi circle is half of a circle, so we will divide it by 2 after finding the area.

Formula for finding semi circle = pi x radius ÷ 2

Formula for radius = diameter ÷ 2

Radius = 36 ÷ 2 = 18mm

Semi circle = 3.14 or 22/7 x 18 = 56.57

56.57 ÷ 2 = 28.285

Note: I don't have a calculator with me right now, so you might want to consider typing out pi x 18 ÷ 2 on a calculator since my answer might be wrong because the answer has endless decimals.

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57 is 13.5% of what number?
kondaur [170]
Let, the number = x
It would be: x * 0.135 = 57
x = 57 / 0.135
x = 422.23

Hope this helps!
6 0
2 years ago
A statistics professor drew a random sample of 81 observations and found that x with bar on top equals 62 s equals 15. Estimate
ratelena [41]

Answer:

LCL = 59.26 to two decimal places

Step-by-step explanation:

Here, we want to estimate the LCL of the population mean with 90% confidence

We proceed as follows;

Given alpha = 0.1, then Z(0.05)=1.645 (from standard normal table), s = 15

Mathematically;

LCL =x_bar -Z*s/√( n)= 62 - (1.645 * 15)/√81

LCL = 62- (24.675)/9 = 59.2583

LCL = 59.26 to two decimal places

3 0
2 years ago
In the diagram below of circle 0, diameter AB is
Nina [5.8K]

Answer:

C. 55°

Step-by-step explanation:

The computation of mAC is shown below:

Given that

Diameter AB would be parallel to CD

McD = 70

Based on the attached diagram and the above information

mAC is

= (180 - 70) ÷ 2

= 55 degrees

hence, the correct option is third

8 0
2 years ago
If a=3, b=5, and c=2, what is a²c²+2(b+c)÷b
finlep [7]
38.8 is the answer. Using pemdas you should find work leading to that
4 0
3 years ago
Help asap will give BRAINLIEST
lord [1]

Answer: point, line, and plane.

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
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