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 Posted: Thu Sep 03, 2009 9:34 am

Joined: Mon Jun 18, 2007 2:32 pm
Posts: 7065
Location: East Kent

once again I am stumped

Does anyone have the IPS 10 practice papers?

test 3 has a question on surface area. There is a net which folds to make a box. Each square square has sides of 2cm. The net has 4 rectangles 4x 2 squares (so 4cm x 8cm), which are the sides of teh box and 2 squares , the ends) which are 2 squares by 2 squares (so 4cm x4 cm)

It asks for the surface area of the box.

Choices given are

160 cubic centimetres
60 cubic centimetres
120 cubic centimetres
48 cubic centimetres
80 cubic centimetres

answer given is 80 square centimetres.

I worked out area of all the sides and added them, thinkig this would be surface area. no answer matched

then thought it may be volume and a misprint ( given cubic centimetres) still no match.

It is probably right under my nose but I am obsessed now!!

all help gratefully received.

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 Post subject: Posted: Thu Sep 03, 2009 10:22 am

Joined: Mon Jun 18, 2007 2:32 pm
Posts: 7065
Location: East Kent
I have it in good authority that the answer is 160 sq centimetres, so a case of bad proof reading.

My faith in my abilities has been restored!!

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 Post subject: Posted: Thu Sep 03, 2009 11:17 am

Joined: Wed Apr 02, 2008 4:20 pm
Posts: 191
I would agree with 160 sq centimetres.

4 rectanges at 4 x 8 cm
32cm x 4 = 128 sq centimetres

2 squares at 4 x 4 cm
16cm x 2 = 32 sq centimetres

128 + 32 = 160 sq centimetres.

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 Post subject: Posted: Thu Sep 03, 2009 11:29 am

Joined: Mon Nov 24, 2008 1:25 pm
Posts: 2556
yes, 160, most def. (feeling a little bit excited that I got it! )
and NOT cubic!

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