Area of the red part?
A normal-level "Area" problem."Take the whole, subtract what you don't want." Get an area problem into this shape and you have won.
GivenSquare with side 10 cm / π = 3.14
Hints
- The red part is "the square minus a sector cut out of it". Start with the square: 10 × 10 = 100 cm².
- What is cut out is a quarter circle of radius 10 cm centred on the bottom-left corner: 10 × 10 × 3.14 ÷ 4 = 78.5 cm².
- The red part that remains is 100 − 78.5.
Answer 21.5cm²
More "Area" problems
- Area of the inner triangle?
- Area of triangle DOA?
- Area of quadrilateral ABCD?
- Area of the overlap?
- Total area of the two crescents?
- Area swept by the square?
Browse by idea
- Add, then subtract — an overlap is a counting problem
- Circles and sectors — multiply by π once, at the very end