Question

1. If a 650 cm ladder is placed against a building at a certain angle, it just reaches a point on the

Answer 1

I’m .....not





.........



C
B

Answer 2

use pythagorean thm:

h = sqrt( aa + bb )

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position 1:

L = h = 650 cm

a = 520 cm

650 = sqrt( 520*520 + bb )

650*650 = 520*520 + bb

bb = 650*650 - 520*520

b = 390 cm

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position 2:

L = h = 650 cm

a = 520 + 80 = 600 cm

650 = sqrt( 600*600 + bb )

650*650 = 600*600 + bb

 

bb = 650*650 - 600*600

b = 250 cm

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Answer:

the ladder will be closer to the building by:

390 - 250 = 140 cm

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