Jawapan

2016-03-16T13:17:56+08:00
Use Pythagoras' theorem to solve this problem: 

a2+b2 = c2 (the ladder) 

c2-a2 = b2 (height of wall) 

100-16 = 84. The square root of 84 is 9.16515139 

Therefore the ladder will reach 9 feet up the wall to the nearest foot.