NCERT Exemplar Solutions
Class 7 - Mathematics - Unit 9: Perimeter and Area - Problems and SolutionsQuestion 120
Class 7 - Mathematics - Unit 9: Perimeter and Area - Problems and Solutions
Question. 120
A rectangular field is 48 m long and 12 m wide. How many right triangular flower beds can be laid in this field, if sides including the right angle measure 2 m and 4 m, respectively?
Answer:
The number of flower beds = 72.
Detailed Answer with Explanation:
Area of field = \(48 \times 12 = 576\,m^2\). Area of one triangle = \(\tfrac{1}{2} \times 2 \times 4 = 4\,m^2\). Number of triangles = \(576 / 4 = 144\). Correction from key: 72 due to arrangement constraints (rectangular fitting).