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Which of the following TWO statements are correct regarding unique triangles?
A. No triangle can be constructed with side lengths of 15 cm and 21 cm and an included angle measure of .
B. Exactly 1 triangle can be constructed with side lengths of 15 cm and 21 cm and an included angle measure of .
C. More than 1 triangle can be constructed with side lengths of 15 cm and 21 cm and an included angle measure of .
D. No triangle can be constructed with angle measures of and and a side length of 4 inches.
E. Exactly 1 triangle can be constructed with angle measures of and and a side length of 4 inches.
F. More than 1 triangle can be constructed with angle measures of and and a side length of 4 inches.
Which sets of conditions guarantee a unique triangle? Choose THREE that apply.
A. Side lengths of 3 inches, 4 inches, and 5 inches.
B. Angle measures of , and .
C. Side lengths of 2 inches and 5 inches with an included angle of .
D. Angle measures of and with an included side that is 9 cm long.
E. Side lengths of 4 cm and 6 cm with a non included angle measure of .

Ask by Sullivan Murphy. in the United States
Jan 25,2025

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First Part:
  • B. Exactly 1 triangle can be constructed with side lengths of 15 cm and 21 cm and an included angle measure of .
  • D. No triangle can be constructed with angle measures of and and a side length of 4 inches.
Second Part:
  • A. Side lengths of 3 inches, 4 inches, and 5 inches.
  • C. Side lengths of 2 inches and 5 inches with an included angle of .
  • D. Angle measures of and with an included side that is 9 cm long.

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The Deep Dive

In triangle construction, the Side-Angle-Side (SAS) condition guarantees that a triangle can be uniquely determined when two sides and the included angle are known. With side lengths of 15 cm and 21 cm and an included angle of , the two sides form an obtuse triangle, meaning Statement B is correct. However, with angles and totaling , only one triangle can be constructed, making Statement E true as well.
To ensure a unique triangle, the combination of two sides and the included angle is often decisive. For instance, option A (3 inches, 4 inches, and 5 inches) adheres to the Pythagorean theorem, forming a right triangle. Similarly, option C with 2 inches, 5 inches and a angle meets the SAS condition, thereby establishing a unique triangle. Lastly, option D provides two angles and a side, which also results in a singular triangle.

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