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The centre of the circle that goes through the vertices of a triangle or a cyclic polygon.

Function of an angle expressed as the ratio of two of the sides of a right triangle that contains that angle; the sine, cosine, tangent, cotangent, secant, and

[[Image:Triangle.jpg|left|frame|Fig.1 ∠BAC ≡ α, ∠ABC ≡ β, &a ...y]], the '''law of sines''' (also known as '''sine rule''') relates in a [[triangle]] the [[sine]]s of the three angles and the lengths of their opposite sides

...oy" mission of the [[Vietnam War]], conducted in January 1967 in the "Iron Triangle" area northwest of Saigon. It was followed by a longer mission in the gener ==Iron Triangle==

In a right triangle, the ratio of the length of the side opposite an acute angle (less than 90

In a right triangle, the squared length of the side opposite the right angle is equal to the su

...gle]]s are '''congruent''' if there is a [[rigid motion]] which brings one triangle exactly onto the other ("superposition"). Since properties of Euclidean ge ...may regard these as stating that the data are sufficient to construct the triangle unambiguously.

The ratio of the sines of the angles of a triangle is equal to the ratio of the lengths of the opposite sides.

The ratio of the sines of the angles of a triangle is equal to the ratio of the lengths of the opposite sides

...venient tabular presentation for the [[binomial coefficients]]: [[Pascal's triangle]]. The same year, a friend interested in gambling posed a question that wou

Inequality which states that for any triangle, the length of a given side must be less than or equal to the sum of the ot

{{r|Pascal's triangle}}

===Pascal's triangle=== ...ay to find the binomial coefficients is by using [[Pascal's triange]]. The triangle is built from apex down, starting with the number one alone on a row. Each

{{r|Pascal's triangle}}

|sym = Triangle * α Trianguli, magnitude 3.4. The Arabic name Metallah means 'Triangle'

{{rpl|Femoral triangle}}

{{r|Triangle inequality}}

...y 40 kilometers west of Baghdad on the Euphrates River. It is in the Sunni Triangle. Two major battles of the [[Iraq War]] were fought there, the [[Iraq War, i

{{r|Triangle geometry}}

...important role in [[right triangle|right triangles]] in that a unit right triangle (where both legs are equal to 1), has a [[hypotenuse]] of <math>\sqrt{2}</m