Draw straight line and mark 60° angle at one end. Use compass to create quarter-circle arcs. Cross arcs to form apex. Draw two straight lines to apex. Erase arcs to complete triangle
Heron's formula calculates triangle area using √[s(s-a)(s-b)(s-c)]. Semi-perimeter (s) equals (a+b+c)/2. Formula was derived by Greek mathematician Heron of Alexandria
Equilateral triangle has three equal sides and angles. It is a special case of isosceles triangle with base. All internal angles are 60°. Area formula is half base multiplied by height
A 60-degree angle is one-sixth of a full circle (360 degrees). It is complementary to 30° and supplementary to 120° angles. The sine of 60° is √3/2, cosine is 1/2, tangent is √3. An angle bisector divides 60° into two equal 30° angles
Equilateral triangle has all sides equal in length. All interior angles are 60 degrees. Perpendicular from any vertex bisects opposite side into two halves. Sum of interior angles equals 180 degrees
Equilateral triangle has all equal angles and sides. Each angle is 60 degrees. Triangle sides are in ratio 1:√3:2