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ICSE-VIII-Mathematics

20: Area of Trapezium and a Polygon Class 8 Maths

with Solutions - page 3
Qstn# B-7 Prvs-QstnNext-Qstn
  • #7
    The diagonal of a square is 12 cm long; find its area and length of one side.
    Ans : Let side of square = a cm
    diagonal = 12 cm
    By Pythagoras Theorem, a2 + a2 = (12)2
    2a2 = 144
    ⇒ a2 = 72
    Area of square = a2 = 72 cm2
    a2 = 72
    ⇒ a = √72 = 8.49 cm