Find the area of the coloured regions

Area of rectangle = 18 × 7

= 126 cm²

Radius of bigger semicircle = 3.5 cm

Area of bigger semicircle

= 19.25 cm²

Radius of smaller semicircle

= 1.75 cm

Area of unshaded region = πr²

= 9.625 cm²

Area of coloured region = Area of bigger semicircle + ( Area of

Rectangle- Area of unshaded region)

Area of coloured region = 19.25 + (126-9.625)

= 19.25 + 116.375

= 135.625 cm²