The measures of two angles of a triangle are 25° and 87°. Is the triangle acute, right, or obtuse? Explain.
Accepted Solution
A:
The triangle is acute. Since all triangles have 180 degrees, you can find the third angle by subtracting the sum of the other angles from 180. 180 - (25 + 87) = third angle 180 - 112 = third angle 68 = third angle Since all three angles are less than 90 degrees, it is an acute triangle.