Posted by Octivia on .
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,
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,
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,
Use the Pythagorean theorem as I showed you above.

math 
Octivia,
Thank you

math 
Ms. Sue,
You're welcome.