In triangle ABC, AD perpendicular to BC, AB = 7.5 cm, AC = 10 cm, AD =6 cm.Find BC.Show that angle BAC =90°.
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Step-by-step explanation:
in triangle abd
by Pythagoras theorm
7.5×7.5=6×6+BD×BD
56.25=36+BD2
20.25=BD2
BD=4.5
un triangle acd
10×10=6×6+ DC2
100=36+DC2
√64=DC
BC=8
BC+DC=8+4.5= 12.5=BC
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