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?

math  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

math  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?

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

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

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