1. First we labelled the triangle.
2. Second we found angle DEF (70 degrees) because it is the exterior angle (the measure of an exterior angle is equal to the sum of the interior opposite angles) to angle ADE.
3. Then we found out that x= 100 degrees because it is the exterior angle to andgle CDE.
4. And finally we found y=60 be cause x is exterior to angle BAC, therefore you already knew that one angle in triangle ABC was fourty and 40 + y = x whereas x=100, therefore y= 60.
After that problem was solved we went on to another set of problems where the reflexive property was required. The reflexive property means that something is identical to itself.
This triangle is congruent due to the Congruent Triangles Law (SSS).
After that the class went over Circle Geometry - Investigation 2.
We were shown methods of finding the middle of the circle and then he assigned us Investigation 3 for homework.
Next blogger, which was randomly selected, is Stephanie.
1 comment:
For finding x on the first question, did you notice that it was supplement to angle DCE? You can find DCE by remembering that the sum of the angles of a triangle is 180 degrees.
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