Area of an Equilateral Triangle
Area of an Equilateral Triangle Somebody left this in my message box: Problem If a triangle is an equilateral triangle with 3m and you are not given the perpendicular length of a triangle, how do you...
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Angle inscribed in a semicircle To solve the two problems below you need to know 1) The area of a circle is Πr2, with r as radius and that the area of a semicircle is of course half of the circle,...
View ArticleProving trigonometric identities #2
Proving trigonometric identities #2 Problem: Prove that the equation below is an identity: 2 sin2Ө – sin4Ө = (1 – cos2Ө)(1 + cos2Ө). Solution To prove that an equation is an identity, one must show...
View ArticleThe Cosine Rule and the Quadratic Formula
The Cosine Rule and the Quadratic Formula In trigonometry, the Cosine Rule (also known as Law of Cosine) relates the lengths of the sides of a triangle to the cosine of one of its angles. The following...
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