Fill in the blanks to make the statements true.

The sum of an exterior angle of a triangle and its adjacent angle is always ________.

If ∆ABC and ∆DBC are on the same base BC, AB = DC and AC = DB (Fig. 6.21), then which of the following gives a congruence relationship?

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The ________ triangle always has altitude outside itself.

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The longest side of a right angled triangle is called its ________.

Fill in the blanks to make the statements true.

Median is also called ________ in an equilateral triangle.