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Structured drill of multiplication tables—much more effective than random drill!
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The ideas in this geometry lesson are taken from the Geometry ebook that I sell at MathMammoth.com. This lesson plan does not contain all the problems the Geometry ebook does. Angles of a triangle
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In the previous study you probably made a guess that the sum of the
angles in a triangle is 180. That is true. Here is a proof for it. Look at the picture.
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1. Calculate the angle marked with the question mark. Note: do not measure since the pictures are not exact. What principles should you use?
[Pictures available in the ebook]
2. Draw a triangle whose all three angles have the same measure. What is that measure?
3. Try to draw a triangle that has two right angles. Can you do it? Why?
6. Draw a triangle whose one angle is 35 and another angle is 85. Can you draw the triangle without calculating the measure of the third angle?
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