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120^o

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< 120^o

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109.5^o

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               Ideal Angle     109.5^o                                Act. Angle   < 109.5^o

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Ideal Angles 90^o, 120^o

See-Saw

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Angles < 180^o, 109.5^o

T-Shaped

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Angle < 90^o

Square Pyramidal

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Angle < 90^o

Square Planar

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Angles 90^o