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Triangle Angles Worksheet

Geometry Math · printable worksheet (PDF) with answer key · 14 problems · CCSS HSG.CO.C.10

A printable geometry triangle angles practice worksheet with 14 problems and a complete, step-by-step answer key — formatted to print cleanly on standard paper. Included in the one-time $20 unlock for the full NudgeLearn library.

Sample problems

Use the triangle angle facts to find each unknown. The three interior angles of a triangle add to $18 0^{\circ}$ . 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. A triangle has two angles measuring $5 4^{\circ}$ and $6 1^{\circ}$ . Find the measure $x$ of the third angle.
2. A right triangle has one acute angle measuring $3 8^{\circ}$ . Find the measure $x$ of the other acute angle.
3. Find the value of $x$ in the triangle.
4. Find the value of $x$ in the right triangle.

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

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