A, B, C and D are the four vertices in a quadrilateral. This angle formed is always greater than 0o and less than 180o . The meeting point of the axes is called as origin having number line on each axis. Focus is the Latin word for fireplace. i.e. The origins of this word are also Latin. When two lines meet, we say they intersect; the meeting point is called the point of intersection. The fixed point is called the center. Orthocentre: The point of intersection (or concurrence) of the three altitudes of a triangle is called its orthocentre.The meeting point (H) of the altitudes AL, CN and BM of the triangle is called … In geometry, a median of a triangle is a line segment joining a vertex to the midpoint of the opposite side, thus bisecting that side. Any two sides with a common endpoint are called the adjacent sides. Construction: Let the three medians meet in G. Answer: Let x be the the fourth angle. ... and the angles between each pair of sides have the same measure, then the two triangles are congruent; that is, they have the same shape and size. Many people are familiar with the ability of magnifying glasses to concentrate sunlight to the point … Angles Like the word lens, the word focus first started to appear in scientific writing in the 17th century. The join of any two non-adjacent vertices is called a diagonal of the polygon. ... A four-sided polygon having exactly one pair of parallel sides. A line joining the midpoints of two sides of a triangle is parallel to the third side and equal to half of it. We start the proof as follows. Summary. Two intersecting lines form a pair of vertical angles. The intersecting lines (two or more) meet only at one point always. The vertical angles are opposite angles with a common vertex (which is the point of intersection). The side BC is called the base of the triangle. The meeting point of a pair of sides is called its vertex. 3. A four-sided polygon having equal-length sides meeting at right angles. Find its fourth angle. In fact the word "vertex" REFERS to the point where two sides of a triangle meet. The meeting point of the three medians of a triangle is called the centroid. The three angles of a quadrilateral are respectively equal to 110°, 50° and 40°. Every triangle has exactly three medians, one from each vertex, and they all intersect each other at the triangle's centroid.In the case of isosceles and equilateral triangles, a median bisects any angle at a vertex whose two adjacent sides are equal in length. (iii) Angles Angle is the inclination between two sides of a quadrilateral. The four line segments AB, BC, CD and DA are called its sides. If a pair of opposite sides are equal and parallel, the quadrilateral is a parallelogram. Since, the sum of all the angles of a quadrilateral is 360°, we have: 110° + 50° + 40° + x = 360° ⇒ 200° + x = 360° ⇒ x = 160° ∴ The fourth angle is 160°. The intersecting lines can cross each other at any angle. In the triangleABC, the perpendicular drawn to BC, that is AL is the altitude. Three dimensional: Cartesian coordinate for three dimensional consists of three axes. The two sides that are parallel are called the bases of the trapezoid. They walk at a common point pairing perpendicular having orientation and a single unit for each axis. So as The Chaz commented, "intersect" is a verb. Those points in common are called their "intersection." The length has a single unit for both pairs along with an aligned axis. 2. Diagonals of a parallelogram bisect each other. This point is the center of mass of the triangle. So, for example, every pair of sides of a triangle "intersect" at a point called the vertex of the triangle. 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