Class 8 Maths: Quadrilaterals, Data Handling, Squares, Cubes & Comparing Quantities: 30 flashcards
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1. What is the sum of the interior angles of any quadrilateral?
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$360^\circ$
2. Define a parallelogram.
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A quadrilateral with both pairs of opposite sides parallel. Its opposite sides and opposite angles are equal, and its diagonals bisect each other.
3. What makes a rhombus different from a general parallelogram?
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A rhombus is a parallelogram with all four sides equal.
4. What is a trapezium?
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A quadrilateral with exactly one pair of parallel sides.
5. What is a kite?
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A quadrilateral with two pairs of adjacent equal sides.
6. For a regular polygon with $n$ sides, what is each exterior angle?
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$\frac{360^\circ}{n}$
7. For a regular polygon with $n$ sides, what is each interior angle?
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$180^\circ - \frac{360^\circ}{n}$
8. Which digits can a perfect square never end in?
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2, 3, 7, or 8
9. What is true about the number of zeros at the end of a perfect square?
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It is always even.
10. How do you find a square root by prime factorisation?
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Pair identical prime factors and take one factor from each pair, then multiply.
11. List the first five perfect cubes.
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$1, 8, 27, 64, 125$
12. How do you find a cube root by prime factorisation?
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Group prime factors in triples and take one factor from each triple.
13. If a number ends in 2, what digit does its cube end in?
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8
14. How is the mean of a data set calculated?
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$\frac{\text{sum of observations}}{\text{number of observations}}$
15. How do you find the median of data with an even number of observations?
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Sort the data and average the two middle values.
16. What is the mode of a data set?
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The most frequently occurring observation.
17. What is the formula for the sector angle in a pie chart?
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$\frac{\text{value}}{\text{total}} \times 360^\circ$
18. What is the range of probability values?
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Between 0 and 1 inclusive.
19. How do you express what percent $a$ is of $b$?
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$\frac{a}{b} \times 100$
20. What is the formula for profit percentage?
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$\frac{\text{Profit}}{\text{CP}} \times 100$
21. What is the formula for simple interest?
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$\frac{P \times R \times T}{100}$
22. What is the compound interest formula for amount?
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$A = P\left(1 + \frac{R}{100}\right)^n$
23. Discount is always calculated on which price?
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The marked price.
24. What is the area of a square with side $s$?
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$s^2$
25. What is the perimeter of a rectangle with length $l$ and breadth $b$?
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$2(l + b)$
26. What is a double bar graph used for?
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Comparing two datasets side by side.
27. What is grouped data?
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Data arranged in class intervals with tally marks.
28. What is the relationship between a square and a rhombus?
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A square is a rhombus with all angles equal to $90^\circ$.
29. What is the relationship between a square and a rectangle?
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A square is a rectangle with all sides equal.
30. What is the cube of an odd number?
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Always odd.
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