AC = 5 cm ; AB = 5√3 cm ; mas<A = 90
BC² = AC² + AB² = ( 5 cm)² + ( 5√3 cm )² = 25 cm² + 75 cm ² = 100 cm²
BC = √100 cm = 10 cm
aria = AC · AB / 2 = 5cm ·5√3 cm / 2 = 25√3 / 2 cm²
inaltimea AD ;
aria = BC · AD / 2 = 25√3 /2 cm ²
10 cm · AD = 25√3 cm²
AD = 5√3 / 2 cm