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Class 7 - Mathematics - Unit 9: Perimeter and Area - Multiple Choice QuestionsQuestion 15
Class 7 - Mathematics - Unit 9: Perimeter and Area - Multiple Choice Questions
Question. 15
15. Area of triangle PQR is 100 cm² (Fig. 9.20). If altitude QT is 10 cm, then its base PR is
(a)
(a) 20 cm
(b)
(b) 15 cm
(c)
(c) 10 cm
(d)
(d) 5 cm
Detailed Answer with Explanation:
Area = \( \tfrac{1}{2} \times PR \times QT = 100\).
\( \tfrac{1}{2} \times PR \times 10 = 100 \implies PR = 20 \, cm \).