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Algebra and Geometry Flashcards

6 cards from real RRB NTPC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Algebra and Geometry flashcards as text

  1. If 2x + 3 = 11, what is the value of x?

    Answer: 4

    2x + 3 = 11 → 2x = 11 - 3 = 8 → x = 4.

  2. The angles of a triangle are in the ratio 2:3:4. What is the measure of the largest angle?

    Answer: 80°

    Let angles be 2x, 3x, 4x. Sum = 180°. So 9x = 180° → x = 20°. Largest angle = 4x = 80°.

  3. What is the area of a circle with radius 7 cm? (Use π = 22/7)

    Answer: 154 cm²

    Area = πr² = (22/7) × 7² = (22/7) × 49 = 22 × 7 = 154 cm².

  4. If x + y = 10 and x - y = 4, what is the value of xy?

    Answer: 21

    Adding equations: 2x = 14 → x = 7. Subtracting: 2y = 6 → y = 3. So xy = 7×3 = 21.

  5. The perimeter of a square is 48 cm. What is its area?

    Answer: 144 cm²

    Perimeter = 4 × side → 48 = 4s → s = 12 cm. Area = s² = 12² = 144 cm².

  6. In a right-angled triangle, the hypotenuse is 13 cm and one leg is 5 cm. What is the length of the other leg?

    Answer: 12 cm

    By Pythagoras theorem: a² + b² = c². 5² + b² = 13² → b² = 169 - 25 = 144 → b = 12 cm.

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