April 5, 2025
Exercise 9.1 Q1. Recall that two circles are congruent if they have the same radii. Prove that equal chords of congruent circles subtend equal angles at […]
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April 5, 2025
Exercise 8.1 Q1. If the diagonals of a parallelogram are equal, then show that it is a rectangle.Ans: Given that,AC = BDTo Prove: ABCD is a […]
April 5, 2025
Exercise 7.1 Q1. In quadrilateral ACBD, AC = AD and AB bisects ∠ A. Show that ∆ ABC ≅ ∆ ABD. What can you say about […]
April 5, 2025
Exercise 6.1 Q1. In Fig. 6.13, lines AB and CD intersect at O. If ∠AOC +∠BOE = 70° and ∠BOD = 40°, find ∠BOE and reflex […]
April 5, 2025
Q1. A survey conducted by an organisation for the cause of illness and death among the women between the ages 15–44 (in years) worldwide, found the […]
April 5, 2025
Table of contents Page No. 27 Q1. In a reaction, 5.3 g of sodium carbonate reacted with 6 g of ethanoic acid. The products were 2.2 […]
April 5, 2025
Table of contents Page No. 39 Q1. What are canal rays?Ans: Canal rays are a type of positively charged radiation discovered by E. Goldstein in 1886. They are […]
April 5, 2025
Table of contents Page No. 51 Q1. Who discovered cells and how?Ans: Q2. Why is the cell called the structural and functional unit of life?Ans: Page […]
April 5, 2025
Table of contents Page No. 74 Q1. An object has moved through a distance. Can it have zero displacements? If yes, support your answer with an […]