1 degrees, minutes and seconds of an angle
2 acute angle
3 right angle
4 obtuse angle
5 reflex angle
6 interior angle of a polygon
7 exterior angle of a polygon
8 angle of elevation
9 angle of depression
10 corresponding equal angles
11 alternate equal angles
12 supplementary angles of 180 degrees
13 complimentery angles of 90 degrees
14 vertical opposite equal angles
15 subtended radian in a circle
16 earths tilt angle
17 angles transcribed by instruments
18 tangent ratio angle
19 cosine ratio angle
20 sine ratio angle
21 vertex or apex angle
22 angles around a point add to 360 degrees
23 a way out angle to sign off
In plane geometry at least two angles must be acute in a triangle.
Yes. Any triangle (in the standard Euclidian geometry) has at least 2 angles; some have 3.
acute angleobtuse angleright anglestraight anglecomplete anglezero angleadjacent anglereflex angle
Yes. And so does every other triangle. A right triangle is defined by having one 90 degree angle and two acute angles.
Species
Here is how the word, "Rectangle" is broken down: 'Rect' is from the German for 'Right', which in geometry means 90 degrees. And angle is just angle. Together the are 'Rectangle. All 4 angles in a rectangle or 'right', or 90 degrees.
Total angles 180 degrees. Therefore there cannot be two angles of 90 degrees or more. Therefore there must be at least 2 acute angles.
An isoceles triangle has at least two sides equal; an equilateral has three sides equal so it is also isoceles; and since all angles are acute it is also an acute traingle
All triangles need at least two acute angles
no all triangles have 3 angles
All of the angles in a rectangle are right angles.
At least 3 sides and many more