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 By: acelow (offline)  Sunday, September 22 2013 @ 08:05 AM CDT (Read 795 times)
acelow

Thank you very much..

Newbie

Registered: 05/02/09
Posts: 14

 By: echeewh (offline)  Sunday, September 22 2013 @ 10:49 PM CDT
echeewh

Hey <acelow>

Appreciate that you indicate the <Answerkey> next time, whenever possible. Thank you.

Following is my worked solution:

Let perpendicular height of triangle OPS be h cm

Area of triangle OPS
= (1/2) × 12u × h
= 6u × h

Given that area of triangle OPS is 60 cm2, we have ...

6u × h = 60
h = 60 ÷ 6u = (10/u)

Area of triangle ORS
= (1/2) × 5u × (10/u)
= 25 cm2

========

Trust this helps.

Do let me know again if there's further clarification.

Cheers,
Edward

Active Member

Registered: 04/21/11
Posts: 627

 By: echeewh (offline)  Monday, September 23 2013 @ 01:21 AM CDT
echeewh

Hey <acelow>

For my worked solution to your Q2 (Overlapping Circles), please see attached.

Trust this helps.

Do let me know again if there's further clarification.

Cheers and all the best in your PSLE,
Edward

Active Member

Registered: 04/21/11
Posts: 627

 By: acelow (offline)  Monday, September 23 2013 @ 07:47 AM CDT
acelow

Many thanks for the solution.

I have noted that in the Power Revision 3, Question 28 is asking for the smallest perimeter but in the answer key, its given as C. and in Question 26, which is the triangle question, the answer is 12cm2 but your answer and mine is 25cm2.

Thank you

Newbie

Registered: 05/02/09
Posts: 14

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