Answer:
B) 2\ sq.rt{3}units
Step-by-step explanation:
using Pythagoras theorem
a^2+ b^2=c^2
a^2+ 3^2=(√21)^2
a^2+9= 21
a^2=21-9
a^2=12
a=√12
a=2√3
Hello!
You have to find 45% of 2,920
First change 45% to a decimal
To change percents to decimal, remove the % sign and add a decimal point 2 places to the left.
45% = 0.45
<em>Now multiply</em>
0.45 × 2,920 = 1,314
There are <u>1,314 </u>advertising pieces
The area of a square is 144 cm^2. The measurement of each side is 12 cm
<u>Solution:</u>
Given, The area of a square is 144 
We have to find that what is the measurement of each side.
Now, we know that, area of a square = product of side value with another side value.
Let the side value of given square be "s"
Then, <em>Area of square is given as:</em>

On cancelling square root and square on right side,we get
s = 12
Hence, the side value of the square is 12 cm.