# geometry

 .remove_background_ad { border: 1px solid #555555; padding: .75em; margin: .75em; background-color: #e7e7e7; } .rmbg_image { max-height: 80px; } sum of interior angles (n-2)180 number of diagonals of any polygon is: n(n-3)/2 pythagorean theorem a2 + b2 = c2 special right triangles 3-4-56-8-1012-16-205-20-255-12-1310-24-268-15-177-24-25 the presence of long legs in a right triangle signifies that... the missing side should be determined by the means of x2 - y2 = (x+y)(x-y) special right triangle 45-45-90 the legs have ratio x:x:x(sq root) If the legs of a right triangle are equal the triangle is necessarily a 45-45-90 30-60-90 triangle has angles x: x( cubed root): 2x if the length of the hypotenuse of a right triangle doubles the length of one of its legs... it is a 30-60-90 how many 30-60-90 triangles are in a hexgon? twelve in similar triangles the ratio of the areas of two similar triangles is equal to... the square of the ratio of the corresponding sides area of a triangle 1/2 * base * height area of rectangle and square length * width area of parallelogram or rhombus base times height area of a rhombus as well is... diagonal 1 * diagonal 2/ 2 area of a trapezoid base 1 * base 2 / 2 * height area of a circle pie * r2 circumference of a circle 2pie *r circumference of a circle 2 * pie * r or pie * d pie = 22/7 length of an arc 2 * pie * r * x/360 length of a sector of a circle pie * r2 * x/ 360 Inscribed angle properties 1. the inscribed angle of an arc is always half the measure of its central angle2. inscribed angles drawn to the same arc have equal measures.3. the inscribed angles of equal measure have arcs of equal length and arcs of equal length have inscribed angles of equal measure. inscribed and circumscribed polygons 1. an inscribed or circumscribed polygon always has the same center as the circle.2. is a triangle is inscribed in a circle so that one of its sides is the diameter of the circle then that triangle is always a right triangle. volume of rectangular solid length * wideth * height surface area of rectangular solid 2 (lw +wh+ hl) or sum of the area of its faces. diagonal of rectangular solid... square root of l2 + w2 + h2 volume of a cube volume of a cube s3 surface area of a cube 6s3 diagonal of a cube s square root of 3 volume of a cylinder pie *r2 * height surface area of a cylinder 2 * pie * r * h + 2 (pie * r2) .remove_background_ad { border: 1px solid #555555; padding: .75em; margin: .75em; background-color: #e7e7e7; } .rmbg_image { max-height: 80px; } Authorkaytea1112 ID28708 Card Setgeometry Descriptionarrrr Updated2010-08-02T12:40:09Z Show Answers