To do this part of the lesson,
download this

Geometer's Sketchpad
file.

Open the Sketchpad file and follow the following steps.

**DATA: 12 cm bolt circle
diameter - 5 bolt pattern**

The first thing we need to find is the **BOLT SPACING**
which is the number of degrees between each of the lug nuts.

**STEP 1:** Measure
<EAD, <DAC, <CAB , <BAE , <FAE

What do you notice about each of the lug spacings?

**STEP 2:** Add all the
angle measures. What do you get?

**STEP 3:** In a 4 bolt
pattern, each of the angle measures was measured as be 90. What is the
sum of all the angle measures?

**STEP 4:** Make a conclusion about the
sum of the lug spacing angles for any numbered bolt pattern.

**STEP 5:** If there were 6
lug nuts on a tire, what would the lug spacing be?

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Problem Statement- -Go to Lesson
Worksheet 2-