rectangle
part of speech
noun (rectangle, rectangles)
meaning for a pupil
1) A rectangle is a flat shape with four straight sides and four square corners (right angles). Its opposite sides are equal and parallel. tree →
2) A square is a special rectangle with all four sides equal. tree →
sense in the lessons
In maths: a shape with length and width; problems find its perimeter or area; arrays and area models use rectangles. In everyday life: doors, books, phone screens, sports fields and tables are rectangles. In art: drawing with a ruler.
examples
- A rectangle is 8 cm long and 5 cm wide. tree →
- Find the perimeter of the rectangle. tree →
- The area of the rectangle is 24 square meters. tree →
- A rectangle has a length of 10 and a width of 4. tree →
- A door is shaped like a rectangle. tree →
- Every square is a rectangle, but not every rectangle is a square. tree →
- A rectangle has four right angles. tree →
- Fold the rectangle along its line of symmetry. tree →
- Draw a rectangle on squared paper and count the squares inside. tree →
note
Area = length × width; perimeter = 2 × (length + width). Trap: the question word (area or perimeter) decides which, not the shape. Hidden numbers: 4 sides, 4 right angles (90° each), 2 lines of symmetry (a square has 4). Area is in square units (cm²), perimeter in units (cm).
In the corpora
- A rectangle covered by rows of unit squares has length × width of them.
- A rectangle 6 cm long and 4 cm wide holds 4 rows of 6 squares: 6 × 4 = 24 square centimeters.
- Some problems need two steps: first the area of a rectangle, then a fraction of that area.
- The perimeter of a rectangle is twice the length plus twice the width, so half the perimeter is length + width.
- Cut it into two rectangles instead, 10 by 5 and 6 by 3: 50 + 18 = 68, the same.
Trees and pragmatics
Every meaning and example of «rectangle» parsed by Mova, each sentence with its dependency tree and frames.