The perimeter of the shape is found by adding all the sides of the shape. One side of the triangle is 7 cm, and the other is twice as large:
7 * 2 = 14 cm – the second side of the triangle;
Find the third unknown side by subtracting two known sides from the perimeter:
32 – 7 – 14 = 32 – 21 = 11 cm – the third side of the triangle.
Answer: 11 cm
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