unit circle 1.2

• a point on the circumference of the unit circle has coordinates (-√2/2 , √2/2. What angle is this?

  135degree
• (-1/2 , -√3/2). What angle is this?

  240degree
• (0, -1). What angle?

  270degree
• cos120degree. value?

  -1/2
• sin225degree, value?

  -√2/2
• cos315degree. Value?

  √2/2
• sin150degree, value?

  1/2
• • Equilateral Triangle: A triangle is considered to be an equilateral triangle when all three sides have the same length.
• isosceles triangle: When two sides of a triangle are equal or congruent.
• Scalene triangle: When none of the sides of a triangle are equal.
• What are the types of triangles based on sides?

  Equilateral, Isosceles, Scalene
• Acute Triangle: When all the angles of a triangle are acute, that is, they measure less than 90°.
• Right Triangle: When one of the angles of a triangle is 90°
• Obtuse Triangle: When one of the angles of a triangle is an obtuse angle, that is, it measures greater than 90°
• what are the types of triangles based on angles?

  Acute, obtuse, right
• name the following

  A) equilateral triangle

  B) isosceles triangle

  C) scalene triangle

  
• name the following:

  A) acute triangle

  B) right triangle

  C) obtuse triangle