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Construction of Quadrilaterals — MATHS STD 8 — Question

Gujarat BoardEnglish MediumSTD 8MATHSConstruction of Quadrilaterals1 Mark
Question
Fill in the blanks. A pentagon has ______ diagonals.
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Answer

A pentagon has $5$ diagonals.
Solution: If n is the number of sides,
the number of diagonals $=\frac{\text{n}(\text{n}-3)}{2}$
$=\frac{5(5-3)}{2}$
$=5$

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