The length of a rectangle is two - fifths of the radius of a circle. The radius of the circle is equal to the side of the square, whose area is 6400 sq.units. What is the area (in sq.units) of the rectangle if the rectangle if the breadth is 10 units? Choose the correct answer:
A) 140 sq.units
B) 320 sq.units
C) 367sq.units
D) 178sq.units
E) 176sq.units
Given that the area of the square = 6400 sq.units   =&gt; Side of square = √6400 = 80 units   The radius of the circle = side of the square = 80 units Length of the rectangle = 2/5 * 80= 
<gadget id="calculator">2/5 * 80</gadget>
<output>32</output>
32 units   Given that breadth= 10 units   Area of the rectangle = lb = 32 * 10= 
<gadget id="calculator">32 * 10</gadget>
<output>320</output>
320 sq.units   Answer:320 sq.units
<result>B</result>
The length of a rectangle is two - fifths of the radius of a circle. The radius of the circle is equal to the side of the square, whose area is 6400 sq.units. What is the area (in sq.units) of the rectangle if the rectangle if the breadth is 10 units?