In a right-angled triangle , where angle  is the right angle, side  is the  and side BC is the  when we take the ratios for the angle .

It seems like your question is incomplete. In a right-angled triangle, there are three sides: the base, the perpendicular, and the hypotenuse. The hypotenuse is the longest side, and it is opposite the right angle. The other two sides are referred to based on their relation to the angles.

If we are taking the ratios for a specific angle, we could be referring to the sine, cosine, or tangent of that angle.

• The sine of an angle is the ratio of the length of the side opposite the angle to the length of the hypotenuse.
• The cosine of an angle is the ratio of the length of the adjacent side to the length of the hypotenuse.
• The tangent of an angle is the ratio of the length of the opposite side to the length of the adjacent side.

Could you please provide more details or clarify your question?