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ryzh [129]
3 years ago
12

: Cho tam giác ABC vuông tại C, trong đó AC = 0,9m, BC = 1,2m. Tính các tỉ số lượng giác của góc B, từ đó suy ra các tỉ số lượng

giác của góc A.
Mathematics
1 answer:
Xelga [282]3 years ago
5 0

Answer:

Step-by-step explanation:

Vì tam giác ABC vuông tại C nên ta áp dụng định lí pitago=> AB²=AC²+BC²=0.9²+1.5²=3.06=>AB= (3 căn bậc hai của 34)/10

sin B=AC/AB=(3 căn bậc hai của 34)/34

cos B=BC/AB

tan B= AC/BC

cot B= BC/AC

Tương tự suy ra tỉ số lượng giác góc A

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Firdavs [7]
1quart=2pints
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now we have
4pints>10pints
false since 4>10

FALSE

3 0
2 years ago
Yesterday 270 concert tickets were sold. today 216 were sold. what is the percent of change
UNO [17]
Given:
yesterday = 270
today = 216

yesterday's number of tickets sold is the basis of the percent of change. So, 270 is the 100%.

270 - 216 = 54  * value of the change in ticket sales

54/270 = 0.20 x 100% = 20%  * percent of change

There was a 20% decrease in ticket sales.

3 0
3 years ago
Factor the algebraic expression.<br> 20a + 12
Studentka2010 [4]

Answer:

32a

Step-by-step explanation:

20a + 12 = 32a

Hope this helps..

4 0
2 years ago
Read 2 more answers
Make x the subject of the formula x(a-b)=a(b-x).​
ddd [48]

Answer:

Hello,

Step-by-step explanation:

x(a-b)=a(b-x)\\\\x(a-b)=ab-ax\\\\x(a-b)+ax=ab\\\\x(a-b+a)=ab\\\\x(2a-b)=ab\\\\\\x=\dfrac{ab}{2a-b} \ if\ 2a-b\neq 0

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30 in
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