LiveLesson Recordings
You may find here links to all the weekly group LiveLesson recordings for Geometry A.
08/26 - In this LiveLesson we explored how to draw surface nets, isometric drawings, and orthographic drawings. We also answered a variety of questions regarding these geometric representations.
09/02 - In this LiveLesson we learned the basic principles of geometric construction with a straight edge and compass. Then we copied a segment, copied an angle, bisected an angle and constructed the perpendicular bisector of a segment. Finally, we explored a couple of the common mistakes made when constructing.
09/09 - In this LiveLesson we found an end point given a midpoint and another end point. We then found the area and perimeter of a triangle, given the coordinates of the vertices, using the distance formula.
09/16 - In this LiveLesson we defined conditional statement, hypothesis, conclusion, negation, counterexample, and wrote the converse, inverse and contrapositive of a given statement. We learned to explain conditional statements in a VENN diagram.
09/30 - In this LiveLesson we learned about angle pairs formed by a transversal and two crossed lines. We explored what happens when the lines are parallel. We then proved the vertical angle theorem.
10/14 - In this LiveLesson we did the Unit 4 Portfolio on Constructions together. I demonstrated each of the constructions using a compass and straight edge on paper, instead of using my computer drawing software.
10/21 - In this LiveLesson we learned the four types of transformations: translation, reflection, rotation and dilation. We modelled translation on a graph and figured out the transformation notation for it. We then modelled the same transformation in Desmos and animated it.
11/04 - In this LiveLesson we used a Desmos interactivity to explore translations, x-axis and y-axis reflections, 180-degree rotations, reflections across lines that aren't axis, 90-degree rotations and dilations.
11/11 - In this LiveLesson we defined what it means for two polygons to be congruent. We then verified you can get away with just three sides to prove triangles congruent by doing a drawing in Geogebra. Finally, we did a proof using the SSS triangle congruence postulate.
11/18 - In this LiveLesson we practiced using CPCTC in two proofs. The big idea is that before you can use CPCTC you must first have congruent triangles.
12/09 - In this LiveLesson we proved parts of triangles congruent for two overlapping triangle proofs. We emphasized the need to sketch the triangles separately and the principal of starting with what is given and ending with what is being proven. We also mentioned that in order to use CPCTC you must first have congruent triangles.
12/16 - In this LiveLesson we reviewed and explored the differences between circumcenter, incenter, centroid, and orthocenter, as the points of concurrence of the perpendicular bisectors, angle bisectors, medians, and altitudes. We also explored some of the properties of each in Geogebra.
01/06 - In this LiveLesson we discussed the triangle inequality and its implications. We explored sorting sides and angles, shortest to longest, in Geogebra and then sorted the sides of a triangle given algebraic expressions for its angles.
09/02 - In this LiveLesson we learned the basic principles of geometric construction with a straight edge and compass. Then we copied a segment, copied an angle, bisected an angle and constructed the perpendicular bisector of a segment. Finally, we explored a couple of the common mistakes made when constructing.
09/09 - In this LiveLesson we found an end point given a midpoint and another end point. We then found the area and perimeter of a triangle, given the coordinates of the vertices, using the distance formula.
09/16 - In this LiveLesson we defined conditional statement, hypothesis, conclusion, negation, counterexample, and wrote the converse, inverse and contrapositive of a given statement. We learned to explain conditional statements in a VENN diagram.
09/30 - In this LiveLesson we learned about angle pairs formed by a transversal and two crossed lines. We explored what happens when the lines are parallel. We then proved the vertical angle theorem.
10/14 - In this LiveLesson we did the Unit 4 Portfolio on Constructions together. I demonstrated each of the constructions using a compass and straight edge on paper, instead of using my computer drawing software.
10/21 - In this LiveLesson we learned the four types of transformations: translation, reflection, rotation and dilation. We modelled translation on a graph and figured out the transformation notation for it. We then modelled the same transformation in Desmos and animated it.
11/04 - In this LiveLesson we used a Desmos interactivity to explore translations, x-axis and y-axis reflections, 180-degree rotations, reflections across lines that aren't axis, 90-degree rotations and dilations.
11/11 - In this LiveLesson we defined what it means for two polygons to be congruent. We then verified you can get away with just three sides to prove triangles congruent by doing a drawing in Geogebra. Finally, we did a proof using the SSS triangle congruence postulate.
11/18 - In this LiveLesson we practiced using CPCTC in two proofs. The big idea is that before you can use CPCTC you must first have congruent triangles.
12/09 - In this LiveLesson we proved parts of triangles congruent for two overlapping triangle proofs. We emphasized the need to sketch the triangles separately and the principal of starting with what is given and ending with what is being proven. We also mentioned that in order to use CPCTC you must first have congruent triangles.
12/16 - In this LiveLesson we reviewed and explored the differences between circumcenter, incenter, centroid, and orthocenter, as the points of concurrence of the perpendicular bisectors, angle bisectors, medians, and altitudes. We also explored some of the properties of each in Geogebra.
01/06 - In this LiveLesson we discussed the triangle inequality and its implications. We explored sorting sides and angles, shortest to longest, in Geogebra and then sorted the sides of a triangle given algebraic expressions for its angles.