The figure below is formed by five identical equilateral triangles. The total perimeter of the five triangles is 135 cm. What is the perimeter of the figure? Ans: ___ cm

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Worked solution

1. Find the length of one side of the equilateral triangle

Total number of sides for $5$ separate triangles $= 5 \times 3 = 15$
Length of $1$ side $= 135 \div 15 = 9$ cm

2. Calculate the perimeter of the figure

The outer boundary of the figure consists of $7$ solid edges.
Perimeter of the figure $= 7 \times 9 = 63$ cm

Answer

$63$

AI analysis — may contain mistakes.

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