Exhibition Grade

Classifying triangles~Geometry 10th Grade?

Exhibits~
Annie is standing in front of a museum exhibition. When she turns her head 60 degrees to the left, she can see a statue by Tania. When she turns her head 60 Degrees to the right, she can see a statue by Paulie. The two statues and Annie form the Vertices of a triangle. Classify this triangle as Acute, Right, or Obtuse

In any triangle, two of the interior angles are always acute (less than 90 degrees)*, so there are three possibilities for the third angle:

Less than 90° – all three angles are acute and so the triangle is acute.
Exactly 90° – it is a right triangle
Greater than 90° (obtuse): the triangle is an obtuse triangle.

Acute: 60 + 60 = 120. The third angle is 60.

2010 CSA Grade School Cheerdance Exhibition – Grade 6

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