The 3 interior angles of any triangle add up to 180 degrees
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By measuring them with a protractor will confirm that the 3 acute angles of a triangle add up to 180 degrees.
It means to find all of its sides and angles.
You will also need the angles so that you can use the Isosceles Triangle Theorems to solve for the base of isosceles triangle when only two sides are given.
To solve this, use the fact that the sum of all three angles, in a triangle, is 180 degrees.
A spherical triangle is not a question or a puzzle that you can solve, or even slove! You need to specify what information you have and what you wish to solve for: angles, lengths of sides, perimeter, area and so on.