tolong jawabannya dan caranya

9) t² = 13² - (15 - 10)² = 13² - 5² = 169 - 25 = 144 maka t = 12 cm
    K = a + b + sisi miring + t = 10 + 15 + 13 + 12 = 50 cm
10) Lpp = p . l
      105 = 15 . l maka l = 105 : 15 = 7 cm
       K = 2 (p + l) = 2 (15 + 7) = 2 . 22 = 44 cm