Worksheets › Class 8 › Quadrilaterals: Thinking Puzzles
Class 8 · Computational Thinking and AI worksheetQuadrilaterals: Thinking Puzzles
CBSE Computational Thinking and AI. Shape families and their properties, colouring logic puzzles, counting rectangles and squares in grids, mirror-image boards, angle ratios. Every sheet has 20 questions in three sections and an answer key, and the questions change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
The angles of any quadrilateral add up to:
- 270°
- 540°
- 180°
- 360°
Answer
(d) 360°
- 2.
Which of these always has at least one line of symmetry but does not always have diagonals that bisect each other? (A kite here is not a rhombus.)
- rhombus
- parallelogram
- square
- kite
Answer
(d) kite
at least one line of symmetry: square, rectangle, rhombus, kite; diagonals that bisect each other: square, rectangle, rhombus, parallelogram
- 3.
A grid of 4 × 2 unit squares is drawn. How many rectangles of any size are there in it (squares count as rectangles)?
- 30
- 8
- 11
- 22
Answer
(a) 30
choose 2 of the 5 horizontal lines and 2 of the 3 vertical lines: 10 × 3
Section B · short answer
- 4.
Why is every square a rectangle but not every rectangle a square?
Answer
A square has all the properties of a rectangle (four right angles) and also equal sides, which a rectangle need not have.
- 5.
How many rectangles (including squares) are there in a grid of 8 × 6 unit squares?
Answer
756
36 × 21
Section C · long answer
- 6.
A kite, a rhombus, a square and a parallelogram are coloured blue, yellow, orange and red, one colour each. (A kite here is not a rhombus.) • The kite is not yellow. • The red shape has all four sides equal. • The blue shape has diagonals that bisect each other. • The yellow shape has all four sides equal. • The yellow shape has equal diagonals. What colour is (a) the parallelogram (b) the rhombus?
Answer
(a) blue; (b) red
kite: orange, rhombus: red, square: yellow, parallelogram: blue
Fresh sheets for your child
In the app, every Quadrilaterals: Thinking Puzzles sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
Coming soon for Android and iPhone.