The double ladder

The double ladder has three meters-long shoulders. What is the height of the upper ladder reach if the lower ends are 1.8 meters apart?

Correct answer:

x =  2.8618 m

Step-by-step explanation:

a=3 m b=1.8/2=109=0.9 m  a2 = b2 + x2 x=a2b2=320.92=2.8618 m

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