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  • Question
  • ? DEF is right angled at E. If m?D = 30°, what is the length of DE (in cm), if EF = 6?3 cm?


  • Options
  • A. 18
  • B. 12?3
  • C. 18?3
  • D. 12

  • Correct Answer
  • 18 


  • Area problems


    Search Results


    • 1. What is the measure (in degree) of an exterior angle of a regular polygon of 9 sides?

    • Options
    • A. 36
    • B. 40
    • C. 30
    • D. 24
    • Discuss
    • 2. If the radius of a circumscribed circle in an equilateral triangle is 14 cm. Then what will be the radius (in cm) of the inscribed circle?

    • Options
    • A. 7
    • B. 14
    • C. 28
    • D. 35
    • Discuss
    • 3. The circumference of a circle is 88 cm, find its area?

    • Options
    • A. 616 sq cm
    • B. 308 sq cm
    • C. 154 sq cm
    • D. 77 sq cm
    • Discuss
    • 4. What is the measure of an interior angle of a regular decagon?

    • Options
    • A. 120°
    • B. 140°
    • C. 144°
    • D. 150°
    • Discuss
    • 5. In a colored picture of blue and yellow color, blue and yellow color is used in the ratio of 4:3 respectively. If in upper half, blue : yellow is 2:3, then in the lower half blue : yellow is

    • Options
    • A. 1 : 1
    • B. 2 : 1
    • C. 26 : 9
    • D. 9 : 26
    • Discuss
    • 6. The length and breadth of a rectangle are 24 cm and 7 cm respectively. Calculate its perimeter (in cm).

    • Options
    • A. 124
    • B. 48
    • C. 62
    • D. 96
    • Discuss
    • 7. What is the reflection of the point (-0.5, 6) in the x-axis?

    • Options
    • A. (0.5, -6)
    • B. (-6, -0.5)
    • C. (6, -0.5)
    • D. (-0.5, -6)
    • Discuss
    • 8. The areas of two similar triangles ?ABC and ?PQR are 36 sq cms and 9 sq cms respectively. If PQ = 4 cm then what is the length of AB (in cm)?

    • Options
    • A. 16
    • B. 12
    • C. 8
    • D. 6
    • Discuss
    • 9. If the perimeter of a semi-circle is 108 cm, then find its radius (in cm).

    • Options
    • A. 42
    • B. 28
    • C. 56
    • D. 21
    • Discuss
    • 10. If the length of the side of an equilateral triangle is 8 cm, what is its area?

    • Options
    • A. 32?3 sq cm
    • B. 16 sq cm
    • C. 16?3 sq cm
    • D. 32 sq cm
    • Discuss


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