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Arnab Nandy · Answer 1 · 2018-07-10T12:15:35+0000

A triangle has 180° total internal angle. The number 4 in the ratio means that 4/(6+4+5) = 4/15 of the total internal angle is made of angle b.

This means that angle b = 4/15 * 180° = 48°.

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