2 years ago

O is the centre of the circle shown below.

1 answer:

4 0

$\angle EHF=90^{\circ}$ (an angle inscribed in a semicircle is a right angle)

$\angle HEF=38^{\circ}$ (alternate segment theorem)

$a=52^{\circ}$ (angles in a triangle add to 180 degrees)

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