GB-25-04-001 · Shaded circular region
A circular hole of radius 3 cm is cut from a rectangular metal plate measuring 16 cm by 13 cm. Work out the area of metal remaining. Give your answer to 1 decimal place.
Shaded Areas: Rectangle Minus Circle
Booklet p. 38 & p. 83
Method
1) Identify large shape (rectangle) and small shape (circle)
2) Find area of each (lw and πr²)
3) Subtract areas
Worked Example (GB-25-04-001)
1)
Rectangle area = 208.
2)
3)
179.7 cm²
Ans =
179.7 cm²