Hello, my name is Grace. Today I will be your guide for the mini-poster I created.
This is a right angle. A right is an angle of 90°, as in a corner of a square or at the intersection of two perpendicular straight lines.
This is an adjacent angle.Two angles are Adjacent when they have a common side and a common vertex (corner point) and don't overlap. Angle ABC is adjacent to angle CBD. Because: they have a common side (line CB) they have a common vertex (point B).
Diameter is a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.
A chord of a circle is a straight line segment whose endpoints both lie on the circle. A secant line, or just secant, is the infinite line extension of a chord. More generally, a chord is a line segment joining two points on any curve, for instance an ellipse.
An a cute triangle is a triangle with all three angles acute (less than 90°). An obtuse triangle is one with one obtuse angle (greater than 90°) and two acute angles. Since a triangle's angles must sum to 180°, no triangle can have more than one obtuse angle.