Answer:
39.30 
Step-by-step explanation:
The area of the top surface of the wedge is the same as the area of a sector.
Area of a sector = (θ/
)
where: θ is the central angle, and r is the radius.
Given that: central angle = 
, radius = 10 centimetre.
Area of the top surface = Area of a sector = (θ/)
= 
x 
x 
= 
x x 100
= 39.2857
= 39.30
The area of the top surface of the wedge is 39.30 .
Heya friend,
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Let the digits at ones place be x. Then,
the digits at tens place = (8-x)
Original number = 10(8-x) + x
= 80 - 10x + x
= 80 - 9x
On interchanging the digits
new number obtained = 10x + 8-x
= 9x + 8
According to question,
New number - Original number = 18
9x + 8 - (80-9x) = 18
=> 9x + 8 - 80 + 9x = 18
=> 18x - 72 = 18
=> 18x = 18 + 72
=> 18x = 90
=> x = 90/18
=> x = 5
Hence, the digits at ones place is 5.
The digits at tens place = (8-5) = 3.
So, the original number is 35 and the new number is 53.
Thanks
A .
- If the number after the decimal is 5+ you round up .. if its 4 and below you round down
2/6-2/10= 0.133333333333=.13
