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I really need help with this proof. The statement I need to prove is prove that if a:b=a':b' then (a+a'):(b+b')=a:b. I can get to the (a+a'):(b+b') without any problem but I am having trouble getting a:b. Thanks

I would like to apologize to galactus, Mrspi, Denis, and soroban for this post I submitted. It really relates to a post I made about a month ago, when I didn't get a reply for 1-3 days; I can't remember for sure. I didn't mean any disrespect to anyone, and I'm not sure how to attach my drawings...

Is there a reason I never get a reply?

I'm having problems solving this proof. Two circles intersect at the points A and B, and through A, a secant is drawn intersecting the circles at the points C and D. Prove that the measure of the angle CBD is constant, i.e. it is the same for all such secants. When I draw it out on MS Publisher...

I am having trouble with this proof and need some help. Prove that a median drawn to a side is of a triangle is smaller than the semisum of the other two sides. Hint: Double the median by prolonging it past the midpoint of the first side.

Thanks

Suppose that an angle, its bisector, and one side of this angle in one triangle are respectively congruent to an angle, its bisector, and one side of this angle in another triangle. Prove that such triangles are congruent. Ive been given angle, side; can i get the other side from the angle...

I need help on these 2 proofs. 1. Prove that if all sides and angles of a triangle are congruent, then the triangle is equilateral. 2. Prove that if 2 sides and angles of a triangle are congruent then the triangle is isosceles.

Thank you Mrspi I think that will do it

horizontal line with a vertical line coming up from the horizontal line the angles on either side of the vertical line are supplementary, are they not?

my drawing didn't come out properly but my angles are adjacent to each other

i i _______________i_____________ here is my diagram so they are adjacent

the problem reads "prove bisectors of two supplementary angles are perpendicular to each other"

i have a horizontal line with a vertical line coming up from it. the angle on the right of the vertical line is 60 degrees and bisected 30 degrees. that leaves the other angle on the left of the vertical line as 120 degrees and bisected = 60 degrees. sure enough 60 plus 30 is 90 degrees so...

Prove that bisectors of two supplementary angles are perpendicular to each other. please help

Thank you galactus. Sometimes I don't see the forest for the trees. Skinski43

I'm having trouble separating the variables on this differential equation. dy/dx = xy + 3x - y - 3 / xy -2x + 4y - 8

Many thanks to you Loren, and to Subhotosh Kahn for helping me with this problem. I've been working for the past two weeks using 2 different textbooks without success. I'm sure I will sleep better tonight. Do either of you recommend a book that helps students to learn geometry, especially...

Loren, I'm unable to prove that the triangle formed by the median is isosceles. If I can prove both of those angles are equal the rest of the proof goes well. skinski43

Thank you for your help Loren. I will change my strategy and show you my work. Skinski43