book Maths Puzzle Numerical Ability

Could someone help me with this.

Compare. Write <,>,or=

-12_12 or 3_-4

Thanks

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book Other Question

1. how to calculate the fourth vertex of a triangle if three other vertices are given

2. how to find the largest angle in a triangle if its vertices are given 1/p2-1 + 1/p-1
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p/p-1