Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

#1 2011-10-01 08:17:34

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 90,444

3 squares a day.

Hi;

0f1df71a2b0151180e7a306e3d78e17f37dc6ccd.png

What percent of the area of the larger square is in the area of the smallest square?

Stuck again? Lets see what geogebra can do.

1) Draw four points A(0,7), B(7,7),C(7,0) and D(0,0).

2 Draw line segments to each of the points making a square.

3)Use the segment with given length from a point tool to make 4 segments from A,B,C,D of length 2. They will be labeled E,F,G,H.

4)Move these points until they are on the square as in the first picture.

5) Connect line segments to each of these 4 points to make the first interior square. See the second picture.

6)Use the 4 new points to make 4 new line segments of length 2 and put them on the interior square like in drawing 3.

7) You will have 4 new points I,J,K,L. Connect them with line segments to make the third square. See the third picture. Notice the length of one of the sides of the interior square.

The ratio of the two areas is:

Which is 31.6%

That is fairly close to the analytical answer,

Without any math or programming! The ability to make accurate diagrams is a powerful tool!

View Image: mine.png View Image: mine2.png View Image: mine3.png

In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

Offline

Board footer

Powered by FluxBB