Question
IJK is an isosceles triangle in which IJ = IK. The value
of ∠IJK is what percentage less than 120°, if ∠JIK=60°.Solution
According to question, IJ = IK ZIJK = ∠IKJ Now, in AIJK, we have: ∠JIK + ∠IKJ + ∠IJK = 180° 60° + ∠IJK + ∠IJK = 180° 2(IJK)= 120° IJK = 120°/2 = 60° Hence, ∠IJK = 60° Now, Percentage from which ∠IJK = 60° is less than 120° =(120°~60°) /120° × 100 =60°/ 120° × 100 = 50%
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