90 degree rotation (CCW):
(x,y) -> (-y,x)
Answer: 78
Step-by-step explanation: 78
For number two, answer is: r=2
A= π•r^2
C=2 πr
2r=r^2
If r=2 then,
2•2=2^2
4=4
Answer for number three is: A=5981m^2
Explanation for number 3 in photo below.
Good luck.
Answer: 292 tiles
Step-by-step explanation:
To find the number of tiles needed , we need to know the area of the hexagonal tiles and also the area of the room.
<u>Area of hexagon</u>
The area of hexagon is given as :
Area = 

Where a is the length of side.
Therefore:
A = 

A =
X 400
A = (400 x 3 x
) / 2
A = 
A = 1039.23
Also to find the area of the room , we must first convert from m to cm
6.25 m = 6.25 x 100 cm
6.25m = 625 cm
4.85m = 485cm
Therefore: Area of the room = length x breadth
Area = 625 x 485
Area = 303125
Therefore , the number of tiles needed = area of the room / area of hexagon
Number of tiles = 303125/ 1039.23
N = 291.6823032
Therefore , the number of tiles needed ≈ 292
E is 131 degrees (opposite angles are equal)
360-262=98
98/2 = 49
f and d both equal 49 degrees