1. A protracter 2. Square 3. ???
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There are three angles in a triangle but to measure them you would use a protractor.
55 degrees
Use the fact that the sum of the three angles is 180 degrees.Use the fact that the sum of the three angles is 180 degrees.Use the fact that the sum of the three angles is 180 degrees.Use the fact that the sum of the three angles is 180 degrees.
In triangles the angles can be all sorts of measurement but the three angles always add to 180 degrees. In quadrilaterals the angles usually measure to 90degrees in all four corners. But in things line trapezoids and parallelograms the angles differ. In a pentagon the angles are 120 degrees. All five of them.
2 rays