Skills for Elementary Geometry Teachers

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Applications

REMEMBER the 4 W's

Why: What purpose does the measurement have?

Where: What is the shape?

What: What tools will we be using to measure?

HoW: Make sure it is repeatable.

Symmetrical 3D Shapes

Volume = base x height

Area of the base can lead you to the area of the entire shape. This onyl works with cylinders and prisms.

Volume of a Cylinder

You can also take the label and see that the circumfrence of the circular base is also the length of the side.

Use the formulas for Area = π r^2 and Circumfrence = 2 x π x r

Use base ten blocks. Place the blcoks along the side of the can and find the height. Also do this with the diameter of the circle.

Skills for Elementary Geometry Teachers

Surface Area of 3D Shape

B is the area of the base. This is found when you multiply the sides of the base together. You multiply B by 2 because there are 2 bases. P is the perimeter of the base. H is the height.

SA = 2B + PH

Pythagorean Theorem

One of the 'nice' triangles is where A = 4 and B = 3. Plugging in the equation 4^2 + 3^2 = C^2. When you add 4^2 and 3^2 you get 25. The square root of 25 solves to find C = 5.

Used to find the side and base length of triangles.

A^2 + B^2 = C^2

Area of Circles

You can show this by cutting the circle in half, into another half, and over and over until you get a rectangular row of triangles left. The two bases of this rectangle equal the cirumference of the circle.

The ratio of the circumference of a cicle to its diameter, 2πr

A= πr^2