This is what is called basic geometry, usually for 8th or 9th graders. When one is this age, there will be a text book that explains these things. I suggest you..look..it...up.
in triangle def side de equals 5 and angle d equals 55 find fe
It is an isosceles triangle because the third angle must measure 50 degrees
45 degree
Triangles measure 180 degrees. A triangle that has one 90 degree angle is known as a right triangle.
80 degrees(We're talking strictly about interior angles here.)
You can measure it. Or you can measure some other quantities (for examples, the lengths of the sides of a triangle), and calculate the angle using trigonometry.
67 degrees
37 degree
You cannot. An angle of a triangle can have any value between 0 and 180 degrees.
A degree is a measure of an angle (in geometry), a triangle is a 2-dimensional object. So the question makes no sense.
A right angle
in triangle def side de equals 5 and angle d equals 55 find fe
It is an isosceles triangle because the third angle must measure 50 degrees
To find the measure of angle A in the right triangle, we can use the tangent function: ( \tan(A) = \frac{b}{a} ). Substituting the given values, we have ( \tan(A) = \frac{39.3}{76.4} ). Calculating this gives ( A \approx \tan^{-1}(0.514) ), which is approximately 43 degrees. Thus, angle A is approximately 43 degrees to the nearest degree.
100 degree, 40 degree and 40 degree.
45 degree
60º