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Question
Maths
Aug. 3, 2019, 12:09 p.m.
Answer
If a, b, c are non zero, non coplanar vectors and p=b×c/[a b c] ; q=c×a/[a b c] ; r=a×b/[a b c] then prove that (a b).p (b c).q (c a).r = 3......... (note: there is no gap in prove tht there is a sum sign.)
Maths
Aug. 3, 2019, 11:28 a.m.
Answer
Find x. If points A(3,2,1), B(4,x,5), C(4,2,2) and D(6,5,-1) are coplanar.
Sets misc. Ist question can we write the answer as D subset of A subset of B subset of C
AD is a median of triangle ABC. The bisector of angle ADB and angle ADC meet AB and AC in E and F respectively. Prove that EF is parallel to BC.
AD is a median of triangle ABC. The bisector of angle ADB and angle ADC meet AB and AC in E and F respectively. Prove that EF is parallel to BC.
In triangle ABC, AD is perpendicular to BC. Prove that AB²-BD²=AC²-CD²