Flip the cards and pair each coordinate quantity with its formula.

Exercise and reference answers

Matching pairs

1. A

   Midpoint of (x₁,y₁),(x₂,y₂)

   B

   ((x₁+x₂)/2, (y₁+y₂)/2)

2. A

   Equation of a circle, centre (h,k), radius r

   B

   (x − h)² + (y − k)² = r²

3. A

   Slope between (x₁,y₁) and (x₂,y₂)

   B

   (y₂ − y₁) / (x₂ − x₁)

4. A

   Perpendicular slopes product

   B

   −1

Explanation