Chapter 6

Question 1

What is the equation for the midpoint when you have 2 sets of coords

Answer 1

(X1 + x2) / (2) , (y1 + y2) / (2)

Gives you the x coord and y coord of the midpoint

Question 2

What is the equation of a circle with centre (a, b) and radius r

Answer 2

(x - a)² + (y-b)² = r²

Question 3

What is the equation for the centre of the circle and radius

Answer 3

(X - a)² + (y - b)² = r²

Question 4

What is the equation of a circle with centre (0,0) and radius r is

Answer 4

x² + y² = r²

Question 5

Equation to work out length of diameter with 2 coords

Answer 5

root (x2 - x1)² + (y2 - y1)²

And if you were working out radius you would half the result