Posted by **Octivia** on Thursday, August 25, 2011 at 1:34pm.

A ladder that is 12,5m long rests against a wall with its foot 7,5m away from the wall.How far the ladder reaches up the wall?

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**Ms. Sue**, Thursday, August 25, 2011 at 1:59pm
Use the Pythagorean Theorem and solve for b.

a^2 + b^2 = c^2

7.5^2 + b^2 = 12.5^2

56.25 + b^2 = 156.25

b^2 = 156.25 - 56.25

b^2 = 100

b = 10

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**Octivia**, Thursday, August 25, 2011 at 2:58pm
The foot of the ladder in 4.2 above moves 4m closer to the wall.How much further will the ladder now reach up the wall?

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**Ms. Sue**, Thursday, August 25, 2011 at 3:24pm
Use the Pythagorean theorem as I showed you above.

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**Octivia**, Thursday, August 25, 2011 at 3:50pm
Thank you

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**Ms. Sue**, Thursday, August 25, 2011 at 4:23pm
You're welcome.

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