WAEC - Mathematics (2010 - No. 45)

In the diagram, GI is a tangent to the circle at H. If EF//GI, calculate the size of < EHF

126^o

72^o

64cm^o

32cm^o

Explanation

F = 54^o (Alternate triangle angles)

< GHE = F = 54^o(Angle between a chord and a tangent = angles in the alternate segment)

Now, < GHE + < EHF + < IHF = 180^o(Angles on a straight line)

54^o + < EHF + 54^o = 180^o

< EHF = 180^o - 108^o

= 72^o

WAEC - Mathematics (2010 - No. 45)

Explanation

Comments (0)