2AT Enlarging solids

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 2

You stretch a wire around the equator at a height of 1 meter. How much longer is that wire than the equator?

Today

• Repeat §10.3
•  Enlarging
• Do exercises 
• Next lesson

The base of a cone has a diameter of 12 cm. The volume of the cone is 640.9 cm^3. Calculate the height of this cone.

1. 4.3
2. 5.7
3. 17.0
4. 167.8

Write down the shortest or longest
mathematical word of the theory on p. 135

Enlarging

• factor k belongs to measurements (length, height, depth, width,...)
• An area is enlarged by ....
• So the volume is enlarged by ...... 

Cubic roots

Remember cubic roots? No, see book A, p. 108 for calculating without and with calculator

The length has been multiplied by factor 2. The volume is how many times larger?

1. 2
2. 4
3. 6
4. 8

A volume is 27 times larger

	factor k	k^2	k^3
	measurements (length, circumference, etc)	area	volume
	?		27

Cubic roots

Remember cubic roots? No, see book A, p. 108 for calculating without and with calculator

To do 

• Do exercises 25, 26, 27 and 28 + 29 or 30 on p. 135-136
• You know how to calculate (with) the factor
• You know how to use the factor to get to k^2 and/or k^3
• You know how to get to the factor
• You  can calculate area and volume (how?)

To do 

Do exercises 26, 30, C6 and 34 on p. 134-136 + 139

What did you learn this lesson?