Given an acute triangle ABC, its median AM and its heights BH and CK. The line passes through A and perpendiculars with AM cuts BH and CK at D and E, respectively. Prove that \(\Delta DEM\)is an isosceles triangle.
Consider an acute triangle ABC of area S. Let CD vuong goc AB(D thuoc AB), DM vuong goc AC (M thuoc AC) and DN vuong goc BC(N thuoc BC). Denote by H1 and H2 the orthocentres of the triangle MNC, MND respectively. Find the area of the qudrilateral AH1BH2 in terms of S.
Given the right triangle ABC (A^ = 90o), BD is the bisector of the angle at B ( D of AC ). If AD = 6cm and AB = 12cm then the area of the right triangle ABC is ...... cm2.
I don't know English very much so i can't answere your question. Sory about that :(
Given the right triangle ABC (A^ = 90o), BD is the bisector of the angle at B ( D of AC ). If AD = 6cm and AB = 12cm then the area of the right triangle ABC is ...... cm2.
Mới học lớp 7 thôi, ko làm được bài nhưng để mk dịch đề thử nhá:
Cho tam giác ABC (A^= 90o), BD là tia phân giác của góc B (D thuộc AC). Nếu AD= 6cm, AB= 12cm thì diện tích của tam giác ABC là .....cm2.
Given the right triangle ABC (A^ = 90o), BD is the bisector of the angle at B ( D of AC ). If AD = 6cm and AB = 12cm then the area of the right triangle ABC is ...... cm2.
Given the isosceles triangle ABC (AB=AC) with \(A=108^o\). Draw the bisector AD and BE of angles A and B respectively. Given BE = 10cm. Evaluate AD.
Given the isosceles triangle ABC (AB=AC) with . Draw the bisector AD and BE of angles A and B respectively. Given BE = 10cm. Evaluate AD.
Given an isosceles triangle ABC (AB = AC), \(\widehat{A}\) = 108o. AD and BE are the bisectors of angle A and B, BE = 10cm. Caculate AB.
Given the triangle ABC with median AM, AB=5cm, AC=12cm.
a) Calculate the lengths of BC, AM
b) D for the point symmetric to A with respect to M. Prove AD=BC and calculate the area of ABCD
c) For what condition of right triangle ABC does ABCD become a square?
