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(a) length of  5 triangles = 5 * 9 –  4 * 3 = 45 – 12 = 33 cm

(b) If there were n triangles to form 123 cm, 

123 = 9n – 3( n – 1) = 6n +3

6n = 120

n = 20

Area of the figure formed = 20 * 1/2 * 9 * 12 – 19 * 1/2 * 3 * 4 = 1080 – 114 = 966 cm²

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