Question

Triangle ABC is equilateral with sides 10 cm long. Triangle DEF is formed by drawing lines parallel to, and 1 cm away from the sides of triangle ABC as illustrated. Find the perimeter of triangle DEF. ​

Answer 1

Correct option is C)

Given that perimeter of equilateral triangle = 18 cm

⇒3a=18⇒a=6

∴ Length of the side of equilateral triangle = 6 cm.

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