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  • Question
  • If the radius of a circle is decreased to 25% of its original value, calculate the percentage decrease in the area of the circle


  • Options
  • A. 25%
  • B. 43.75%
  • C. 50%
  • D. 93.75%

  • Correct Answer
  • 93.75% 


  • Area problems


    Search Results


    • 1. What is the area (in sq cm) of a rhombus if the lengths of its diagonals are 25 cm and 20 cm?

    • Options
    • A. 500
    • B. 250
    • C. 125
    • D. 200
    • Discuss
    • 2. Calculate the area (in cm2 ) of a circle of radius 10.5 cm.

    • Options
    • A. 693
    • B. 157.5
    • C. 315
    • D. 346.5
    • Discuss
    • 3. At what point does the line 4x - 3y = -6 intercept the y-axis?

    • Options
    • A. (0,2)
    • B. (0,3/2)
    • C. (2,0)
    • D. (3/2,0)
    • Discuss
    • 4. A pentagonal prism has 15 edges. How many vertices does it have?

    • Options
    • A. 12
    • B. 10
    • C. 15
    • D. 20
    • Discuss
    • 5. Find the volume (in cm3) of a right circular cylinder of diameter 21 cm and height 10 cm.

    • Options
    • A. 3118
    • B. 3275
    • C. 3621
    • D. 3465
    • Discuss
    • 6. The perimeter and the breadth of a rectangle are 60 cm and 14 cm respectively. Find its area (in cm²)

    • Options
    • A. 112
    • B. 448
    • C. 224
    • D. 336
    • Discuss
    • 7. The area of a square is 100 sq cm, find length of its diagonal?

    • Options
    • A. 10?2 cm
    • B. 10 cm
    • C. 20 cm
    • D. 20?2 cm
    • Discuss
    • 8. If the radius of a circle is increased by 14% its area increases by

    • Options
    • A. 28 percent
    • B. 29.96 percent
    • C. 14 percent
    • D. 14.98 percent
    • Discuss
    • 9. In an equilateral triangle of side 24 cms, a circle is inscribed touching its sides. The area of the remaining portion of the triangle is equal to

    • Options
    • A. 36.6 sq. cm
    • B. 54.2 sq. cm
    • C. 72.8 sq. cm
    • D. 98.5 sq. cm
    • Discuss
    • 10. One of the internal angle of a rhombus is 60° and length of its shorter diagonal is 8 cm. What is the area of the rhombus?

    • Options
    • A. 64?3 sq cm
    • B. 32?2 sq cm
    • C. 64?2 sq cm
    • D. 32?3 sq cm
    • Discuss


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