Question

Tolong dijawab semuanya yaa sama caranya pleaseee. nanti dijadiin jawaban yang terbaik pleaseee jawabbb

Answer 1

18)
BC = AB
AB² + BC² = AC²
AB² + AB² = 24²
2AB² = 576
AB² = 288
AB = √288 = √(144×2) = 12√2 (B)


19)
sin 30 = ½
QS/PQ = 1/2
3/PQ= 1/2
PQ = 3×2 = 6

sin 60 = ½√3
PQ/PR = ½√3
6/PR = ½√3
PR = 6×2/(√3)
PR = 12/(√3) × (√3)/(√3)
PR = (12√3)/3 = 4√3 (C)


20)
sin 60 = ½√3
tinggi/BC = ½√3
tinggi/12 = ½√3
tinggi = 12 × ½√3 = 6√3

luas = alas × tinggi = AB × tinggi = 15 × 6√3 = 90√3 (B)