A circular ring of radius 3 cm hangs horizontally from a point 4 cm vertically above its centre by 4 strings attached at equal intervals to its circumference . If the angle between two consecutive strings is` theeta` ,then find the value of cos` theeta`

Explanation

OP=4cm

OA=OB=OC=OD=3cm

`(OA)^2+(OP)^2=(AP)^2`

`AP^2=3^3+4^2=25`

`AP=5cm`

AP=BP=DP=CP=5cm

`AB^2+BC^2=AC^2`

`2AB^2=6^2`

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