| COTANGENTREASON | Basis for using the ratio of adjacent and opposite sides of a triangle, relative to an angle? |
| COUSIN | Relative to an American in the money (6) |
| ADJOINED | Lay adjacent and connected to |
| COTANGENT | In a right-angled triangle, the length of the side adjacent to an angle divided by that of the side opposite it (9) |
| BEVELLED | Cut to an angle |
| LEG | One of the sides of a triangle other than the base or hypotenuse |
| SCALENE | Having three unequal sides, of a triangle |
| ANGLE | Shape formed by two sides of a triangle (5) |
| SINE | In a right-angled triangle, the ratio of the length of the side opposite an angle to the length of the hypotenuse (4) |
| SECANT | In trigonometry, the ratio of the hypotenuse of a right-angled triangle to that of the adjacent side; the reciprocal of the cosine (6) |
| COTAN | Ratio of the adjacent to the opposite side of a right-angled triangle (5) |
| MACH | Physicist who established the principles of supersonics and the ratio of the velocity of a body to the speed of sound (4) |
| COSECANT | In geometry, the ratio of the length of the hypotenuse in a right-angled triangle to that of the opposite side (8) |
| EFFICIENCY | A measure of a mechanical system's effectiveness, usually the ratio of the power delivered by a mechanical system to the power supplied to it (10) |
| NEPER | Unit used in physics to express the ratio of two quantities, equal to the natural logarithm of the ratio of the quantities (5) |
| SPEAR | Opposite side of a family to the distaff, comprising the male line of descent (5) |
| ELNINO | Pattern of surface sea-temperature change which brings extremes of drought and flood to opposite sides of the Pacific ocean (2,4) |
| PILLARS | The ___ of Hercules: ancient name given to mountains on opposite sides of the Strait of Gibraltar (7) |
| FARAD | The capacitance of a capacitor that has an equal and opposite charge of 1 coulomb on each plate and |
| RATEOFRETURN | The ratio of the annual income from an investment to the original investment, often expressed as a percentage (4,2,6) |
