1. 1
2. 2
3. 3
4. 5
2
1. 3
2. 4
3. 1/4
4. 1/3
1/3
1. 1 + r/R
2. 1 - r/R
3. 1 - R/r
4. 1 + R/r
1 + r/R
1. 4R cos A
2. 4R cos B
3. 4R cos C
4. 4R
4R cos B
1. 1: 2
2. 1: 3
3. 2 : 1
4. 3 : 1
3 : 1
1. x2 + y2=3
2. x2 + y2=9
3. x2 + y2=1
4. x2 + y2=81
x2 + y2=9
1. 2√2
2. 2
3. √2
4. 1
√2
1. t < 0
2. 0 < t < 1
3. t > 1
4. t =1
0 < t < 1
1. 7 < a < 11
2. a = 7
3. a =11
4. 1 < 7 or a > 11
1 < 7 or a > 11
1. (-1/2 , -1/2)
2. (-2, -2)
3. (1, 1)
4. (-1, -1)
(-1, -1)