### Translations

Code | Language | Translator | Run | |
---|---|---|---|---|

### Software Requirements

Android | iOS | Windows | MacOS | |

with best with | Chrome | Chrome | Chrome | Chrome |

support full-screen? | Yes. Chrome/Opera No. Firefox/ Samsung Internet | Not yet | Yes | Yes |

cannot work on | some mobile browser that don't understand JavaScript such as..... | cannot work on Internet Explorer 9 and below |

### Credits

This email address is being protected from spambots. You need JavaScript enabled to view it.; Francisco Esquembre; Felix J. Garcia Clemente

### end faq

### Learning Goals

## 2019 PSLE Question on finding Diameter

### Method 1 by the Boring physics teacher https://youtu.be/JuGNaORvxvs

Shift circle C by 12 cm. Therefore, by symmetry looking at the circle B, the diameter is 10+16+10 where 10 is from the shifting of 22-12, the first 10 is by symmetry. The diameter is 36 cm.

### Method 2 by Julie Choy

Shift circle B, C, D and E to the extreme left to align them up. So, the circle C is the odd one out. Then the diameter is sum of the bottom numbers subtract the sum of the top numbers, leading to 22+16+22 - (12+12) =36 cm.

### Method 3

Shift circle D to the extreme left align with circle A. Shift circle E to the extreme right align with circle C. So, the bottom numbers add up is equal to the 2 top numbers plus diameter B. Therefore, the diameter is sum of the bottom numbers subtract the sum of the top numbers, leading to 22+16+22 - (12+12) =36 cm.

### Conclusion

Therefore, the principle to solving this kind of problem is to look out for a pattern that leads to top set of numbers - bottom set of numbers, is the odd length out which is the diameter in this case.

### For Teachers

[text]

Research

[text]

### Video

[text]

### Version:

### Other Resources

[text]

### end faq

# Testimonials (0)

There are no testimonials available for viewing. Login to deploy the article and be the first to submit your review!

You have to login first to see this stats.