S.6

Triangle Angles & Classification

Q4 · Apr–Jun

Use the 180° angle sum to find missing angles, and classify triangles by angles and sides.

Level

Medium

Level

Problems

Show exampleInclude answer key

@page { size: letter; margin: 0; } @media print { .ws-page + .ws-page { break-before: page; } } Daniel Math Academy \cdot Grade 5 Math Triangle Angles & Classification Skill S.6 \cdot Triangles \cdot ★★☆ Medium \cdot Quarter 4 Name Date Score / 6 Scan for answers A triangle's angles add up to 180°. A square marks a 90° angle; ticks mark equal sides. Example 35° ? 55° ? = 9 0^{\circ}, right Think: 18 0^{\circ} - 3 5^{\circ} - 5 5^{\circ} = 9 0^{\circ} . A 9 0^{\circ} angle makes it right, an angle over 9 0^{\circ} makes it obtuse, and three angles under 9 0^{\circ} make it acute. 1 70° ? 57° Find the missing angle. Acute, right, or obtuse? 2 65° ? 89° Find the missing angle. Acute, right, or obtuse? 3 17° 73° ? Find the missing angle. Acute, right, or obtuse? 4 ? 29° Find the missing angle. Acute, right, or obtuse? 5 78° ? 49° Find the missing angle. Acute, right, or obtuse? 6 ? 18° 20° Find the missing angle. Acute, right, or obtuse? Daniel Math Academy \cdot danielmath.com Worksheet # czw3qpj \cdot Page 1 / 2 Daniel Math Academy \cdot Grade 5 Math Answer Key S.6 Triangle Angles & Classification \cdot ★★☆ Medium 1 5 3^{\circ}, acute 2 2 6^{\circ}, acute 3 9 0^{\circ}, right 4 6 1^{\circ}, right 5 5 3^{\circ}, acute 6 14 2^{\circ}, obtuse Daniel Math Academy \cdot danielmath.com Worksheet # czw3qpj \cdot Answer Key \cdot Page 2 / 2

S. Triangles6 skills