## Math 6A, Lesson 16, Spring 2020, 6/21/2020

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Go over the Final Exam, and class celebration party – share your story and your thoughts.  All of our students have worked very hard and have made so much progress. I’m so proud of you! At this unprecedented time, we have had 14 ZOOM classes together with an almost perfect attendance rate! Your patience, resilience, self-motivated-learn and your humorous comments and laughter in the classroom, are the inspiration for me. I love you all!

Keep up your hard work! Have a great summer!

## Math 6A, Lesson 15, Final Exam Spring 2020, 6/14/2020

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Final Exam Spring 2019, 6/9/2019. The exam will cover all the materials we have covered in Spring 2019 term, namely chapter 5 to chapter 8:

## Math 6A, Lesson 14, Spring 2020, 6/6/2020

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1. Perpendicular Bisectors and Angle Bisectors

• Use of compass: center, radius, pin leg, and drawing leg
• To draw a circle
• To mark off or copy a line segment
• How to draw a perpendicular bisector of a line segment?
• Any point on the perpendicular bisector of a line segment is equidistant from the two  end points of the segment.

2. Angle Bisectors

• A ray AZ divides <BAC into two equal angles, <BAZ and <CAZ. The ray is called the angle bisector of <ABC
• How to draw an angle bisector?
• Any point on the angle bisector of an angle is equidistant from the two sides of the angle.

3. Class work

• Construct/draw circles, triangles, angles, equal line segments
• construct /draw perpendicular bisectors of line segments
• construct/draw angle bisectors of angles

4. Classification of Triangles

• The number of equal sides in the triangle: scalene triangle – no equal sides; isosceles triangle – two equal sides; equilateral triangles – three equal sides
• The type of angles of the triangle: acute-angled triangle – all angles are acute; right-angled triangle – one of the angles is a right angle; obtuse-angled triangle – one of the angles is an obtuse angle
• Is an equilateral triangle also an isosceles triangle?
• Is it Possible to draw a triangle with more than one obtuse angle?
• Can a scalene triangle be an acute-angled, right-angled or obtuse-angled triangle?
• All the three angles in a scalene triangle are different size
• The angles opposite the equal sides of an isosceles triangle are equal
• All the three angles in an equilateral triangle are equal in size

• A closed plane figure with four straight sides joined by four vertices is called a quadrilateral
• Vertices, diagonals