http://dicom.nema.org/medical/dicom/current/output/pdf/part02_changes PS3.3 I was very impressed by Hans Vaihinger's "The Philosophy of 'As-If': A system of the theoretical, practical and religious fictions of mankind", Tr C K Ogden, 1st publ England 1924, 2nd edn 1935 ISBN 0 7100 3019 3 London, Routledge & Kegan Paul Ltd. For example, the square root of minus 1 doesn't "exist" but it's very useful for solving problems. Special Segments in Triangles 1. Find AB if BD is a median of A ABC. B R/v-tm = 10) o 3x—4 D 2x— 17 c 3. Find m L ABC if BD is an angle bisector of A ABC. mg-ABC = — In Exercises 4-6, A(2, 5), 13(12, and Cc-6, 8) are the vertices of A ABC. 4. What are the coordinates of K if CK is a median of A ABC? 5. 3.1 LINES AND LINE SEGMENTS ... The sum of any number of angles that form a straight line is 180°. ... or find the measure of one angle based