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108cm² = 1/2 × 15cm × AB
108cm² × 2 ÷ 15cm = AB
AB = 14,4 cm (C)
2) AB² = MN² - (R - r)²
= 1225cm² - (25cm - 4cm)²
= 1225cm² - (21cm)²
= 1225cm² - 441cm²
AB² = 784cm²
AB = 28cm (B)
3) AB² = MN² - (R+r)
576cm² = MN² - (5+2)²
576cm² = MN² - 49cm²
576cm² + 49cm² = MN²
625cm² = MN²
25cm = MN (B)
Mohon maaf untuk segala kekurangannya, tks.