D
use the formula speed = wavelength x wave frequency
Answer:
7. Quadrilateral
8. Trapezoid
9. Quadrilateral
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Step-by-step explanation:
The values are
and 
Explanation:
The expression is 
Simplifying, we get,

Since, both sides of the expression are equal, we can equate the corresponding values of A, B, C and D.
Thus, we get,
⇒
and 
Also, equating,
, we get,
and 
Thus, the values are
and 