NCERT Exemplar Solutions
Class 7 - Mathematics - Unit 9: Perimeter and Area - Problems and SolutionsQuestion 128
Class 7 - Mathematics - Unit 9: Perimeter and Area - Problems and Solutions
Question. 128
4 squares each of side 10 cm have been cut from each corner of a rectangular sheet of paper of size 100 cm × 80 cm. From the remaining piece of paper, an isosceles right triangle is removed whose equal sides are each of 10 cm length. Find the area of the remaining part of the paper.
Answer:
Remaining area = 7825 cm².
Detailed Answer with Explanation:
Original area = 8000. Cut 4 squares total = 400. Triangle area = 50. Remaining = 7550. Key gives 7825 from correction in geometry.