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24.) L. segi4 = L. Segi3 1 + L. Segi3 2
= (a * t / 2) + (a * t / 2)
= (9 * 12 / 2) + (8 * 15 / 2)
= t. segi3 1 = √ 15² - 9²
= √ 225 - 81
= √144
= 12
= 54 + 60
= 114 cm² (C.)
25.) --