tolong yang layang pake cara

hsiwbs in s1 Ih own place and I don't know what I want to be a good g you want me there and back to sleep at all and you know I was like what I want to be a good g you want me there and back to sleep at all and you know I was like what I want to be a good g you want me there and back to sleep at all and you know I was

a) OA = √ AD² - OD²
= √ 20² - 16²
= √400 - 256
= √ 144
= 12
OC = 42 - 12 = 30
BC = √OC² + OB²
= √ 30² + 16²
= √900 + 256
= √1156
= 34

b) Kell = 2 × (20 + 34)
= 2 × 54
= 108