1. If I don’t go to Anu’s party tonight, she will get irritated.
2. If you don’t telephone the hotel to order food, you will miss your meal.
3. Unless you promise to write back, I will not write you another letter.
4. If she doesn’t play any games, she will become lazy.
5. Unless that little bird flies away quickly, the cat will pounce on it and kill it.
(i) The kind of person the doctor is (money, possessions)
(ii) The kind of person he wants to be (appearance, ambition)
ABCD is a quadrilateral in which AD = BC and ∠ DAB = ∠ CBA (see Fig. 7.17). Prove that
(i) ∆ ABD ≅ ∆ BAC
(ii) BD = AC
(iii) ∠ ABD = ∠ BAC.
