â¢ equilateral - all 3 sides are equal. 2) By the types of angles they have: â¢ acute triangle - all 3 angles are acute (less than 90Â°) â¢ right triangle - has one right angle (a right angle = 90Â°) â¢ obtuse triangle - has one obtuse angle (an obtuse angle is greater than 90Â° and less than 180Â°).
Over the last 30 years, the time frame for the carving of the Grand Canyon has gone full circle. Thirty years ago, most evolutionists believed the canyon was about 70 million years old. But that estimate changed as radioisotope dating was utilized to show the plateau to be much older than the canyon itself.
The Grand Canyon is one of the largest gorges in the world, carved over billions of years by the Colorado River in a picturesque part of Arizona. At 277 miles (466 km) long, and as much as 18 miles (29 km) wide, the Grand Canyon is one of the most impressive landforms found anywhere.he Grand Canyon is a short drive from Las Vegas. Cougars roam the Grand Canyon. It took billions of years for the Colorado River to carve out the Grand Canyon. The Grand Canyon is in Arizona, which is located in the American West. Whitewater rafting is available at the Grand Canyon.