The measures of two angles of a triangle are 25° and 87°. Is the triangle acute, right, or obtuse? Explain.
Question
Answer:
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.
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