The triangle ABC is given below :

AC = 5 cm and AB = 6 cm. If the perimeter of the triangle is 18 cm , then find the ratio AB : BC

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Solution

Perimeter of triangle = AB + BC + AC = 5 + 6 + BC = BC + 11

Perimeter is given as 18 cm $[1 m a r k]$

$∴$ BC = 18 - 11 = 7 cm

Ratio AB : BC = 6 : 7 $[1 m a r k]$

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The triangle ABC is given below :

AC = 5 cm and AB = 6 cm. If the perimeter of the triangle is 18 cm , then find the ratio AB : BC

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If AB = 5 cm; QR = 7cm; then find the value of AC (in cm.), if the perimeter of $△$ ABC is 18cm.

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