Section A Section A Checkpoint

Problem 1

Which of the triangles are right triangles? Explain or show your reasoning.

dot paper with 3 triangles.
dot paper with 3 triangles. Triangle A. horizontal side, 3, vertical side, 3. Triangle B. horizontal side, 3, vertical side, 3. Triangle C, horizontal side 4, other two sides equal length forming an obtuse angle.

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Solution
Sample response: Triangle A is a right triangle because the angle at the top right is a right angle. Triangle B is a right triangle because the angle at the bottom left is a right angle. Triangle C is not a right triangle because it does not have any right angles.
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Sample Response
Sample response: Triangle A is a right triangle because the angle at the top right is a right angle. Triangle B is a right triangle because the angle at the bottom left is a right angle. Triangle C is not a right triangle because it does not have any right angles.

Problem 2

  1. Draw a shape that is a rectangle but not a rhombus. Label it A.

  2. Draw a shape that is a rhombus but not a rectangle. Label it B.

blank dot paper

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Solution

Sample response:

dot paper solution

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Sample Response

Sample response:

dot paper solution

Problem 3

Draw all lines of symmetry for each figure.

4 figure with the shapes of the capital letters, A, H, W, N.

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Solution

Lines of symmetry. A. H. W. N.

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Sample Response

Lines of symmetry. A. H. W. N.