## Activity: Understanding Cylinders and Cylindrical Shapes with Tootsie Rolls

**Activity Title:** Understanding Cylinders and Cylindrical Shapes with Tootsie Rolls

**Topic:** Cylinders and ISO Circles

**Objective: **Creating the proper engineering views to describe an object.

**Material:** Tootsie Rolls

**Introduction**: Isometric Circles and Arcs Circles appear as ellipses, and arcs as elliptical arcs on an isometric drawing. You must properly align isometric circles and arcs with the appropriate isometric plane. The minor axis of an ellipse always aligns with the centerline axis of the circular feature. It is also important to locate the correct center point. Examples of ISO circles within isometric drawings.

**Examples of isometric circles:**

**STEP 1: ISO Circles**

**Procedure: **In the space provides, sketch a front, top, and right side view of an ISO circle.

**STEP 2: Cylinders **

**Procedure:** Use the provided “Tootsie Roll” to sketch the CANDY AS YOU SEE IT RIGHT OUT OF THE Package front, top and isometric views in the space provided.

**STEP 3:** Calculate the surface area of the given tootsie roll cylinder using the dimensions from the above sketch.

*A*=2*πrh*+2*πr*^{2}** (Show Work)** _______________________________________________________

Calculate the volume of the given tootsie roll cylinder using the dimensions from the above sketch.

*V*=*πr*2*h * **(Show Work)** _______________________________________________________________

**Questions: **Why are only two views required in an orthographic drawing of a cylinder?