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Class 7 - Mathematics - Unit 9: Perimeter and Area - Multiple Choice QuestionsQuestion 18
Class 7 - Mathematics - Unit 9: Perimeter and Area - Multiple Choice Questions
Question. 18
18. Area of a right-angled triangle is 30 cm². If its smallest side is 5 cm, then its hypotenuse is
(a)
(a) 14 cm
(b)
(b) 13 cm
(c)
(c) 12 cm
(d)
(d) 11 cm
Detailed Answer with Explanation:
Let smaller side = 5 cm, other side = x.
Area = \( \tfrac{1}{2} \times 5 \times x = 30 \implies x = 12 \).
Hypotenuse = \( \sqrt{5^2 + 12^2} = \sqrt{25 + 144} = \sqrt{169} = 13 \, cm \).