This Week in Math 10…

Getting heavier into measurement we received a formula sheet, one that we can use on tests and in the homework so we do not have to memorize all of them. This was very helpful and much appreciated. Unfortunately we had to remember one or two things; finding the slant hight of something with a triangular shape or comes to a point and the formulas for hemi-spheres.

I am going to demonstrate finding the slant height of something with a triangular shape or a shape that comes to a point. There are different shapes you might need find the slant hight for, like a pyramid or a cone.

First lets see the shape we will be using… A cone!

A cone is a shape that looks like a flipped ice cream cone.

Next you will be given some measurements, before this you should know the names of measurements that you need to know.

Blue- the true height

Red- slant height

Yellow- diameter

(the radius is half of the diameter)

Green- radius

Now lets say, you have been giving some measurements…

So, you have been given the True Height and the Diameter, but need to find the slant height…

You have to follow a formula that calls for the radius to be involved, we already know that the radius is half of the diameter therefore..

Our radius is 6.

To find the slant height you need to follow a formula…

h = true height

r = radius

s= slant height

Now you simply plug in the numbers you know into the formula.

Solve what you can… And get your answer!

The Slant Height is equal to 10. The slant height is 10cm.