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- https://phys.libretexts.org/Courses/Coalinga_College/Physical_Science_for_Educators_(CID%3A_PHYS_14)/02%3A_Units_Measurement_Graphing_and_Calculation/2.02%3A_Math_Review/2.2.12%3A_TrianglesTwo triangles are similar if the three angles of one triangle have the same measure as the three angles of the second triangle. The Pythagorean theorem says that the sum of the squares of the lengths ...Two triangles are similar if the three angles of one triangle have the same measure as the three angles of the second triangle. The Pythagorean theorem says that the sum of the squares of the lengths of the legs is equal to the square of the length of the hypotenuse. If you know the lengths of all three sides of a triangle, you can use the Pythagorean theorem to verify whether the triangle is a right triangle or not.
- https://phys.libretexts.org/Courses/Coalinga_College/Physical_Science_for_Educators_(CID%3A_PHYS_14)/02%3A_Units_Measurement_Graphing_and_Calculation/2.02%3A_Math_Review/2.2.06%3A_Perimeter_and_CircumferenceA polygon is a closed geometric figure with straight sides. Common polygons include triangles, squares, rectangles, parallelograms, trapezoids, pentagons, hexagons, octagons… The perimeter of a polygo...A polygon is a closed geometric figure with straight sides. Common polygons include triangles, squares, rectangles, parallelograms, trapezoids, pentagons, hexagons, octagons… The perimeter of a polygon is the distance around the outside. In general, to find the perimeter of a polygon, you can add up the lengths of all of its sides.
- https://phys.libretexts.org/Courses/Fresno_City_College/NATSCI-1A%3A_Natural_Science_for_Educators_Fresno_City_College_(CID%3A_PHYS_140)/02%3A_Units_Measurement_Graphing_and_Calculation/2.02%3A_Math_Review/2.2.12%3A_TrianglesTwo triangles are similar if the three angles of one triangle have the same measure as the three angles of the second triangle. The Pythagorean theorem says that the sum of the squares of the lengths ...Two triangles are similar if the three angles of one triangle have the same measure as the three angles of the second triangle. The Pythagorean theorem says that the sum of the squares of the lengths of the legs is equal to the square of the length of the hypotenuse. If you know the lengths of all three sides of a triangle, you can use the Pythagorean theorem to verify whether the triangle is a right triangle or not.
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Celestial_Mechanics_(Tatum)/13%3A_Calculation_of_Orbital_Elements/13.02%3A_TrianglesThe area of the triangle formed by joining the tips of r2 and r3 is A1. The area of the triangle formed by joining the tips of r1 and r2 is...The area of the triangle formed by joining the tips of r2 and r3 is A1. The area of the triangle formed by joining the tips of r1 and r2 is A3. The two vector products are parallel vectors (they are each perpendicular to the plane of the paper), of magnitudes 2A3 and 2A2 respectively. (2A3 is the area of the parallelogram of which the vectors r1 and r2 form two sides.)
