Qstnid -C-7-i-its Area ; (Ii) Length Of Its Sides. (Iii) Its Perimeter; - 20: Area Of Trapezium And A Polygon Class 8 Maths - Icse-viii-mathematics

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ICSE-VIII-Mathematics

20: Area of Trapezium and a Polygon Class 8 Maths

with Solutions - page 5

Qstn# C-7-i Prvs-Qstn Next-Qstn

#7-i
its area ; (ii) length of its sides. (iii) its perimeter;
Ans : Diagonal of rhombus are 18 cm and 24 cm.
area of rhombus = 1/2 ×Product of diagonals
= 1/2 × 18 × 24
= 216 cm² (ii) Diagonals of rhombus bisect each other at right angles.

∴ OA = ½ × 24 = 12 cm OB =1/2 × 18 = 9 cm
In right ∠d ΔAOB
∴ Side of rhombus = 15 cm (iii) Perimeter of rhombus = 4 × side
= 4 × 15
= 60 cm
(i) 216 cm²(ii) 15 cm(iii) 60 cm

#7-ii
length of its sides.
Ans : Diagonals of rhombus bisect each other at right angles.

∴ OA = ½ × 24 = 12 cm OB =1/2 × 18 = 9 cm
In right ∠d ΔAOB
∴ Side of rhombus = 15 cm

#7-iii
its perimeter;
Ans : Perimeter of rhombus = 4 × side
= 4 × 15
= 60 cm
(i) 216 cm²(ii) 15 cm(iii) 60 cm