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Model Paper 4 — MATHS STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceMATHSModel Paper 41 Mark
MCQ
How many diagonals are there in an octagon?
  • A
    24
  • B
    28
  • C
    20
  • D
    36
✓

Answer

(c) 20
Explanation: No. of diagonals in a polygon of n sides $=\frac{1}{2} n(n-3)$,
Put n = 8, we get 20.

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