Geometry; 5/4

We went over the homework together and then reviewed three different problems in preparation for the quiz tomorrow.  The students then spent the rest of the period working on their review sheet.


Assignment:  Chapter 13 quiz review

page 1 answers

7.  5
9.  13
11.  not on the same line
13.  (1, -3);  r = 4
15.  (-1, 10);  r = 5/3
17.  (x+1)2 + (y+2)2 = 9
19.  (x + 2)2 + y2 = 2
21.  slope of OA = 0;  slope of BC = 0;  slope of OC = 3/2;  slope of AB = 3/2;
      both pairs of opp. sides have the same slope, so the figure is a parallelogram

page 2 answers

1.  2/3
2.  8/5
3.  -1/2
4.  -1/3
5.  undefined
6.  -e/a
11.  3
12.  -8
13.  -1/3
14.  1/2
15.  1/2
16.  -2
17.  -4/3
18.  -4/3
19.  3/4
21.  slope of RS = 1/2;  slope of ST = -3/4;  slope of RT = -2
         RS is perpendicular to RT because their slopes are negative reciprocals
         perpendicular sides mean that a right angle is in the triangle

page 3 answers

4.  (-5, 1);  radical 26
6.  (-1, -2);  radical 5
8.  k = 8
10.  (-2, 7)
12.  (13, 7)
14.  (1, 2)
16.  (4.3, 4)
18.  (e + j / 2  ,  f + k / 2)
20.  10;  4/3;  (1, 1)
22.  (7, 10)
24.  (-5, 1)