10 times 0.84 is 8.4 or 8.40 is completely fine as well.
The area of a square is (side)².
If the area is 128m², then the side is (√128) meters. (That's 8√2.)
The diagonal is the hypotenuse of the right triangle you get
if you slice the square in half along the diagonal. Its length is
given in the words of Old Pythagoras:
c² = a² + b²
'a' and 'b' are sides of the square, so
c² = (√128)² + (√128)²
= 2 (√128)²
c = √ (2 x 128) = √256 = 16 meters .
Answer:D) Under-root 25.Under-root 3
Step-by-step explanation
Under-root 25 = 5
A perfect square is a number that can be expressed as the product of two equal integers.