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#In Right angled ∆ABC,∟BAC= 90°,∟B: ∟C = 1:2 andAC= 4cm.calculate thelenght of BC
 
#In Right angled ∆ABC,∟BAC= 90°,∟B: ∟C = 1:2 andAC= 4cm.calculate thelenght of BC
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''''''Solution'''''''''
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in some special right angled triangle
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whose angle ratio 1:2:3 that is 30-60-90
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has their sides ratio 1: <math>{\sqrt3}</math>  :2
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in ▲ABC,
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BC = 2. AC
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BC = 2.4
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BC = 8 cm
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#A door of width 6 mt has an archabove it having aheight of 2 mt , find the radius if the arch
 
#A door of width 6 mt has an archabove it having aheight of 2 mt , find the radius if the arch
 
# The sides of a right angled triangle are in an AP. Show that sides are in ther ratio 3:4:5
 
# The sides of a right angled triangle are in an AP. Show that sides are in ther ratio 3:4:5