Year 12s: what will be the first way you research your future options? >>

Find the coordinates of B & D.

OCR C1, Misc Ex 1, p23.

4. A(7, 2) and C(1, 4) are to vertices of a square ABCD.

(a) Find in the form of ax + by = c the equation of the diagonal BD

Calculated equation for line AC, used perpendicular gradient and added the midpoint of AC as x & y to get c.. so 3x - y = 9 (thrown my workings in the bin o.O sorry!)

(b) Find the coordinates for B and D..

I can't for the life of me get my head around this one.. I think I'm just having a mental blank.. can somebody help me out?

Thx..

Reply 1

Dragon

Since it's a square, B is equidistant to A and C. B is also on the same horizontal line as A, and the same vertical line as C. You can use this information and the equation for AC to work out the coordinates of B. Do a similar thing for D.

Quick Reply

Latest

Articles for you

Making the grade: A* students share their revision tips and secrets

What is student accommodation like at uni?

How to use past exam papers to revise effectively

What to do if you don’t get an offer from your first choice university

Find the coordinates of B & D.

Quick Reply

Related discussions

Latest

Trending

Trending

Articles for you