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  1. The area of a rhombus is 150 cm². The length of one of its diagonals is 10 cm. The length of the other diagonal is :
    1. 25 cm
    2. 30 cm
    3. 35 cm
    4. 40 cm
Correct Option: B

Using Rule 12,
Let d1, d2 be the diagonals of a rhombus,

Area =
1
d1.d2
2

⇒ 150 =
1
× 10 × d2
2

⇒ d2 =
150
= 30 cm
5



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