Answer:
Let "a", "b" and "с" be sides of the triangle ("с" is the longest side).
The triangle will be:
right if a² + b² = c²
аcute if a² + b² > c²
obtuse if a² + b² < c²
a.
a=3, b=4 and c=5
a² + b² = 3² + 4² = 9 + 16 = 25 and c² = 5² = 25
25 = 25 ⇒ right triangle.
b.
a=5, b=6 and c=7
a² + b² = 5² + 6² = 25 + 36 = 61 and c² = 7² = 49
61 > 49 ⇒ аcute triangle.
c.
a=8, b=9 and c=12
a² + b² = 8² + 9² = 64 + 81 = 145 and c² = 12² = 144
145 > 144 ⇒ аcute triangle.
Explanation:
Mark brainliest please!!
B. . Doctrine that the US had the right and duty to expand throughout North America.
Answer:
In topographical terms, the Massif Central is land lying mostly at above 500 metres, and includes most of the regions of Auvergne and Limousin, plus parts of the regions of Rhone-Alpes, Languedoc, and Midi-Pyrenees.
Occupying about one-sixth of France (33,000 square miles [86,000 square km]), the massif, for the most part, consists of plateaus lying between 2,000 and 3,000 feet (600 and 900 m).
