a circular ground whose diameter is 35 metres , has a 1.4 metre - broad garden around inside of it . what is the area of the garden in square metres ?
"req . area = ï € [ ( 35 ) 2 â € “ ( 33.6 ) 2 ] = 22 â  „ 7 ã — ( 68.6 ã — 1.4 ) [ since a 2 - b 2 = ( a + b ) ( a - b ) ] = ( 22 ã — 68.6 ã — 0.2 = 301.84 sq m . answer e"
subtract(circle_area(add(divide(35, 1.4), 1.4)), circle_area(divide(35, 1.4)))