SIDES OF A RIGHT ANGLED TRIANGLE. 

GIVEN ANY RIGHT ANGLED TRIANGLE, ITS SIDES ARE NAMED ACCORDING TO THE ANGLE GIVEN AT HAND. FOR EXAMPLE,

FROM THE DIAGRAM ABOVE,

(I) THE SIDE OPPOSITE THE RIGHT ANGLE IS CALLED THE HYPOTENUSE.

(II) THE SIDE OPPOSITE THE THE GIVEN ANGLE OTHER THAN RIGHT ANGLE IS CALLED THE OPPOSITE.

(III) THE SIDE NEXT TO THE GIVEN ANGLE OTHER THAN THE HYPOTENUSE IS CALLED THE ADJACENT SIDE.