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2. s = akar pangkat dua dari ( 5^2 - 3^2 )
s = akar pngkat dua dari 16
s = 4
= 1/2 . 3 . 4
= 2. 3
= 6 cm²
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AD = √(AC)² - ((AC² + BC² -AB²) / (2BC))²
= √3² - ((3² + 5² - 4²) / (2.5))²
= √9 - ((9 + 5 - 4) / (10))²
= √9 - ((10 / 10)²
= √9 - 1²
= √9 - 1
= √8
= √4.√2
= 2√2 cm