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Warm Up. Given: AM = BM Prove:<AMP = <BMO. Circle O 1. Given AM = BM 2. Given MO = MO 3. Reflexive Prop Draw AO and BO 4. Two points determine a segment AO = BO 5. All radii of a circle are congruent 6. Δ AMO = Δ BMO 6. SSS 7. <AMO = <BMO 7. CPCTC.
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Warm Up Given: AM = BM Prove:<AMP = <BMO • Circle O 1. Given • AM = BM 2. Given • MO = MO 3. Reflexive Prop • Draw AO and BO 4. Two points determine a segment • AO = BO 5. All radii of a circle are • congruent • 6. ΔAMO = ΔBMO 6. SSS • 7. <AMO = <BMO 7. CPCTC
3.4 Beyond CPCTC Medians: Every triangle has 3 medians A median is a line segment drawn from any vertex to the midpoint of its opposite side. A median bisects the segment.
B E F A C D Name the 3 medians of triangle ABC.
Altitudes: Every triangle has 3 altitudes. An altitude is a line segment drawn perpendicular from any vertex to its opposite side. *The altitude could be drawn outside the triangle to be perpendicular. Altitudes form right angles 90˚ You may need to use auxiliary lines (lines added)
Could an altitude also be a median? Yes, for an isosceles triangle when drawn from the vertex.
Postulate: Two points determine a line, ray or segment. Determine (one and only one line)