Answer:
46cm²
Explanation:
Find the diagram attached.
The area of the baking sheet left uncovered = Area of rectangle - Area of the 6 circular biscuits
Area of the rectangle = Length * Width
Given
Length = 12cm
Width = 18cm
Area of the rectangle = 12*18
Area of the rectangle = 216cm²
The diameter of one of the circle = Length/3
The diameter of one of the circle = 18/3 = 6cm
Area of a circle = πd²/4
Area of a circle = π(6)²/4
Area of a circle = 36π/4
Area of a circle = 9π cm ²
Area of the six circular biscuit = 6(9π) = 54πcm²
Area of the six circular biscuit = 54(3.14) = 169.56cm²
Area of the baking sheet left uncovered = 216 - 169.56
Area of the baking sheet left uncovered = 46.44cm²
Area of the baking sheet left uncovered is approximately 46cm²