Surface Area of Prisms and Cubes

The formulas are long, but if you follow them closely, you can figure out the surface area of prisms and cubes with ease.

Need to see the formulas for these shapes again? Check out this site.


Tonight finish questions 1-20 on the worksheet handed out in class.

No Homework

We'll review today's quiz tomorrow, and then pick up by learning about surface area!

Test: Monday

Use your study guide to prepare for our quiz on Monday. No class on Friday.

Space Figures and Nets

Three dimensional shapes are also known as space figures.

Based on the number of bases and the shapes of their faces, you can classify them as:

prisms
pyramids
spheres
cones
cylinders

Tonight, study your definitions and answer the questions on Practice 10-4.

Drawing 3-D Shapes in 2-D

Last week, we practiced drawing 3-dimensional shapes on iso dot paper. The shapes you came back with over the weekend look great!

Now, we're looking at how these shapes look in a two-dimensional landscape, forgetting about depth and perspective.

Tonight, look at the shapes on page 520 in your text. Draw each shape from the front, top and right side view.

Due tomorrow.

Isometric Figures

Today we drew some isometric shapes. Some of you were able to do it quickly, for others it wasn't that easy to see and draw in 3-D.

Make sure to hold the paper in a landscape view, and never draw lines that are horizontal!

Finish four of the drawings over the weekend.

Area of a Circle

Today we saw how the area of a circle relates to the area of a parallelogram.

If we cut a circle and rearrange its parts to be rectangular, we can see that the height is equal to the radius of that circle






The length or base is equal to half the circumference (3.14 x r) of the circle.

Therefore, the area of a circle is 3.14 x r xr

Look at the site Math Goodies for a good refresher.

Tonight, complete Practice Worksheet 10-2.

Reviewing Trapezoids

Yesterday we had some trouble with trapezoids.

Look online at some sites to help you if you are still having trouble. Try this one, too: Trapezoid Calculator.

Remember: the lines that are parallel are your bases.

Complete Reteach 10-2 tonight.

Area of Triangles and Parallelograms

Practice 10-2 goes along with today's lesson on area of triangles and trapezoids.

Area of a triangle
1/2 base x height

Area of a trapezoid
1/2 h (base1 + base2)

Want to review today's lesson? Look at this great PowerPoint.

Area of Parallelograms

Rectangle, square, rhombus or parallelogram, it doesn't matter. Use the same formula when figuring out the area of these polygons.

A=base x height
or
A=bh

Need help? Check out this quick demo video.




Tonight, finish worksheet 10-1.