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Answer Key
Grade 7 Math: Triangles & Conditions for Unique Triangles
1.
a+b>c (and similarly for other pairs)
2.
yes
3.
no
4.
a unique triangle (up to congruence)
5.
no; similar but not unique size
6.
two sides and the included angle
7.
two angles and the included side
8.
80°
9.
yes; 7+10>15, 7+15>10, 10+15>7
10.
yes; 70°
11.
same shape, different sizes possible
12.
SSS, SAS, ASA, or AAS (examples)
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