Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 211
16, and their includedangle is 45°, find the third side. 200 PLANE GEOMETRY Ex. 737. If in triangle ABC, angle C = 120*^, prove thatAB^ = BG^ + AC^ + ACBC. Ex. 738. If a line is drawn from the vertex C of an isosceles tri-angle ABCi meeting base AB prolonged at D, prove that C& - CB^ = AD . BD.… … Given A ABC with m„, the median to side a. a? a To prove Ir + cr = 2[-] +2 m^^. 9 Argument 1. Suppose 6>c; then A ADC is obtuse and Z BDA is acute. 2. Let p be the projection of m^ upon a. 3. Then from A J DC, 2 a ?>2 = f^^+m/ + 2^Vp. a 4. And from A ABD, <.= 2U».>-3 5 p. a 5. .-.…
Geometry, Plane · Geometry, Solid
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