Question

The end points of the diameter of a
circle are at (1,2) and (7,-6). What is the circumference of the circle, to the nearest tenth of a unit

Answer 1

Find the diameter of circle using pythagoras
d = √(Δx² + Δy²)
d = √((7-1)² + (-6-2)²)
d = √(6² + (-8)²)
d = √100
d = 10
The diameter is 10

Find the circumference
c = π × d
c = 3.14 × 10
c = 31.4