Triangle Angles (Set 2) Worksheet

Sample problems

Use the triangle angle facts to find each unknown. The three interior angles of a triangle add to $180^{\circ }$. An exterior angle equals the sum of the two remote interior angles. In an isosceles triangle the base angles (opposite the equal sides) are equal.

1. 1. A triangle has two angles measuring $39^{\circ }$ and $76^{\circ }$. Find the measure $x$ of the third angle.
2. 2. A right triangle has one acute angle measuring $27^{\circ }$. Find the measure $x$ of the other acute angle.
3. 3. Find the value of $x$ in the triangle.
4. 4. A right triangle is used to brace a shelf. Its right angle sits at the wall and one of the acute angles measures $42^{\circ }$. Find the measure of the remaining acute angle.

Plus 10 more problems and a full answer key in the PDF.