This formative checks understanding of TEKS 6.8A: the triangle angle-sum, how side lengths relate to angle measures, and how to determine whether three lengths can form a triangle.
In a triangle, the measures of two angles are 48° and 67°. What is the measure of the third angle?
Triangle ABC has sides AB = 5 cm, BC = 8 cm, and AC = 10 cm. Which angle is the largest?
Which sets of side lengths can form a triangle? (Select all that apply.)
Which statement is always true about the sides and angles of a triangle?
A triangle has angles 35° and 92°. Enter the measure of the third angle (in degrees).
Categorize each set of side lengths as “Forms a triangle” or “Does not form a triangle.”
5, 6, 10
7, 7, 9
8, 9, 16
3, 5, 8
4, 4, 9
6, 10, 16
Forms a triangle
Does not form a triangle
Two angles of a triangle measure 74° and 51°. What is the measure of the third angle?
Match each triangle fact to the correct description.
| Stavka koja se može prevući | arrow_right_alt | Odgovarajuća stavka |
|---|---|---|
Triangle angle sum | arrow_right_alt | Opposite largest angle |
Triangle inequality | arrow_right_alt | Opposite smallest angle |
Shortest side | arrow_right_alt | 180° |
Longest side | arrow_right_alt | Two sides’ sum > third |
Categorize each set of angle measures as “Sum is 180°” or “Sum is not 180°.”
72°, 58°, 50°
110°, 35°, 35°
95°, 40°, 45°
60°, 50°, 50°
120°, 30°, 40°
88°, 44°, 44°
Sum is 180°
Sum is not 180°
Which sets of angle measures could be the three angles of a triangle? (Select all that apply.)
Which set of angle measures cannot form a triangle because the sum is not 180°?
Side lengths are 9 cm, 11 cm, and 19 cm. Can these lengths form a triangle?
In a triangle, two angles measure 62.8° and 47.6°. What is the measure of the third angle?
In a triangle, two angles measure 44.9° and 44.9°. What is the measure of the third angle?
A triangle has angles 37.4° and 92.1°. Enter the measure of the third angle (in degrees).