Given:
Radius of a circle = 21 m
Area of a sector of the circle = 27.72 m²
To find:
The angle at the center of the circle.
Solution:
The area of a second is:
Where, r is the radius of the circle and is the central angle.
Putting in the above formula, we get
Therefore, the central angle of the sector is .
(x-3)²=5
x²-6x+9= 5
x²-6x+9-5=0
x²-6x+4=0
D=b²-4ac
= (-6)²-4×1×4
=36-16
= 20
x1=(-b-VD)/2a
= (6-V20)/2
=( 6- V4 × V5)/2
= (6-2V5)/2
= 3-V5
x2= (-b+VD)/2a
= (6+2V5)/2
= 3+V5
-> answer A
Answer:
20.58 rounded to 21 years
Step-by-step explanation:
147 *14%=
147*0.14=
20.58 ROUND TO 21 years
D. (the one in the right hand bottom corner)
40°
56+84=140
180-140=40°