beiachapman122
17.10.2021 •
Mathematics
ABC is a right triangle in which ∠B = 90°. D is a point on BC such that DC=AB. DE and BF are perpendicular to AC. If BF = 4cm, then CE+BF =________
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Ответ:
Step-by-step explanation
taco: góc FBC + góc FBA = 90° mà góc FBA + góc FAB = 90
⇒góc FAC = góc FBC mà góc FBC = góc EDC ⇒ góc FAC = góc EDF
xét Δ ABF và Δ DCE có
góc FAC = góc EDF
góc F = góc E = 90°
⇒ tam giác ABF đồng dạng với tam giác DCE
⇒ AB/DC = BF/EC ⇒ AB.EC = DC.BF mà AB = DC ⇒ EC=BF=4
Ответ:
D. Learning of Galileo's imprisonment
Step-by-step explanation:
Read the article, lol. Answer is correct on Ed.