A triangle has two equal sides. a)
What is the special name for this type of triangle?
b)
One of the angles in this triangle measures 100°.
What is the size of each of the other two angles?
+

A. isosceles triangle

B. each two angles equal 40°

Step-by-step explanation:

A. the special name for this type of triangle is isosceles triangle.

As isosceles triangles are the triangles whose base angels are equal and the Two sides are equal.

B.

given

one angle = 100°

As it is isosceles triangle so two angles are equal. So let the angle be x

Then

x + x + 100° = 180° [sum of angles of triangle ]

2x = 180° - 100°

2x = 80°

2x = 80°

x = 40°

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this