Question

HELPPP REPEDEEE
DAU COROANA!!!

Answer 1

1 a b316242

2abcd 16252715

Answer 2

1. ΔABC: AB² = BC² - AC² → AB² = 256 → AB = 16cm. SΔABC = (AD x BC)/2 = (AC x AB)/2 → 12 x 16 = AD x 20 → AD = 9,6cm; ΔADB: DB² = AB² - AD² → DB² = 163,84cm →DB = 12,8cm → DC = BC - BD → DC = 7,2cm

2. Fie CE⊥AB si DF⊥AB. ΔCEB: CEB = 90° si EBC = 60° → BCE = 30° → BE = BC/2 = 12cm; AB = AF+FE+EB, dar AF = EB → AB = 2EB+EF = 12 + 24 = 36cm. ΔBEC: CE² = BC² - EB² → CE² = 576-144 = 432 → CE = 12√3cm. Perimetrul ABCD = AB+2BC+CD = 36+48+12 = 96cm; Aria ABCD = [(AB + CD) x CE]/2 = 288√3 cm²