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180.5 x 2 = 361
sqrt 361 = 19
19 * 18 /2 = 171 as the answer

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(a)
5 x 0.5 + 10 = 12.5

(b)
180.5 x 2 = 361 = 19 x 19 (Figure 19) ——-> 19 triangles ——-> 9.5 sq cm
180.5 – 9.5 = 171

Ans : (a) 12.5; (b) 171 squares.

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