Question

Last marathon.

4. The graph shows the
relationship between the
diameter and the
circumference of a circle
with the point (1, π) shown.
Find 3 more points that are
on the line.
CA
12
10+
8+
6+
4+
2+
marathon was a 10% less than the time to
(1, x)
+
2
+3
4
5
6
d

Answer 1

See attached worksheet.

Explanation:

Two approaches are taken to find the tree additional points:

1. Direct selection from the graph, and

2. Forming a linear equation to calculate the three points.

The details of each are shown on the attached worksheet.

The direct selection approach is easiest, but has the most error due to the lack of a graph with sufficient detail to identify precise values. The calculated approach forms an equation for the line, and then calculates precise values for the selected x inputs.