Triangle ABC is right -angled at vertex A. Calculate the length of BC, if :

AB = 12 cm and AC = 9 cm

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Solution

$∠ B A C = 90^{\circ}$
$B C^{2} = A B^{2} + A C^{2}$ (Using Pythagoras Theorem)
$B C^{2} = 9^{2} + 12^{2}$
$B C^{2} = 225$
$B C = 15 c m$

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Triangle ABC is right -angled at vertex A. Calculate the length of BC, if :AB = 12 cm and AC = 9 cm

∠BAC=90∘BC2=AB2+AC2 (Using Pythagoras Theorem)BC2=92+122BC2=225BC=15cm

Triangle ABC is right -angled at vertex A. Calculate the length of BC, if :

AB = 12 cm and AC = 9 cm

$∠ B A C = 90^{\circ}$
$B C^{2} = A B^{2} + A C^{2}$ (Using Pythagoras Theorem)
$B C^{2} = 9^{2} + 12^{2}$
$B C^{2} = 225$
$B C = 15 c m$