Answer:

Step-by-step explanation:
The area of a rectangle formula is length times width.
The length of this rectangle is
, and the width of this rectangle is 
Thus, the area of the rectangle is
. This can be expanded using FOIL.
First 
Outer 
Inner 
Last 
The two x terms combine, making 8x, and the answer is 
It is not a right triangle because 21^2+28^2 is not equal to 36^2
[a^2+b^2 must equal c^2)
]
Answer:
hii
Step-by-step explanation: