Question

8. Fig. 10.35 shows the jib PQ of a crane.
PQ = 20 m. Find the height QR when the
reach PR is 12 m.​

Answer 1

Answer:

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Answer 2

PQ=20m,

PR=12m,

QR=? (find)

According to question

using pithagoras therom :PQ2=PR2+QR2

:(20) 2=(12) 2+QR2

:400=144+QR2

: QR2=400-144

:QR2=256

:QR=√256

: QR=16

so, height of QR=16m.