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Solve a practical right-angled-triangle problem

DIFFICULTYintrostandardchallengeexam
QUESTION TYPEMix of allChange
Find a length: set AFind a length: set BFind a length: set CNOWMix of allRecommended
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A taut stay cable supports a vertical radio antenna from a peg on level ground. F is the ground peg; E is the cable attachment on the antenna; D is the base of the antenna

Triangle FED: FD is horizontal; DE is vertical upwards; FE slopes upwards from F. Right angle at D. The angle from ray FD to ray FE is 60°. FE = 10 m; ED = x m. Not to scale.10 mx mFED60°
FD horizontal; DE vertical. Not to scale
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What is the height of the cable attachment in metres, rounded to 1 decimal place?

Format: 1 d.p.