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Solve a practical right-angled-triangle problem

DIFFICULTYintrochallenge
QUESTION TYPEMix of allChange
Find a length: set AFind a length: set BFind a length: set CNOWMix of allRecommended
Question 1 of 8

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A roof cross-section has a straight rafter from an eave to the ridge. D is the eave; F is the ridge; E is the point directly below the ridge at eave level

Triangle DFE: DE is horizontal; EF is vertical upwards; DF slopes upwards from D. Right angle at E. The angle from ray DE to ray DF is 22°. DF = 12 m; FE = x m. Not to scale.12 mx mDFE22°
DE horizontal; EF vertical. Not to scale
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Determine the vertical roof rise in metres, rounded to 1 decimal place

Format: 1 d.p.