Angles and sides of triangles

Answer Key - Grade 6 Math Worksheet - Challenge Me

Circle the best answer, or write your answer on the line.

1. 1.

   Luz sketches a boat sail as an isosceles triangle. Its top angle is 40°, and its two base angles are equal. How big is each base angle, in degrees?

   70
2. 2.

   Noah sketches a castle pennant as an isosceles triangle. Its top angle is 20°, and its two base angles are equal. How big is each base angle, in degrees?

   80
3. 3.

   Pia sketches a tent end as an isosceles triangle. Its top angle is 80°, and its two base angles are equal. How big is each base angle, in degrees?

   50
4. 4.

   Ren sketches a tower pennant as an isosceles triangle. Its two equal base angles are 50° each. How big is the top angle, in degrees?

   80
5. 5.

   Tala sketches a tent end as an isosceles triangle. Its two equal base angles are 35° each. How big is the top angle, in degrees?

   110
6. 6.

   Zee sketches a school roof end as an isosceles triangle. Its two equal base angles are 65° each. How big is the top angle, in degrees?

   50
7. 7.

   Bo fences a triangular carrot patch. Two fences are 6 ft and 9 ft long. The third fence is a whole number of feet. What is the longest the third fence can be?

   14
8. 8.

   Esme fences a triangular turtle pen. Two fences are 7 ft and 12 ft long. The third fence is a whole number of feet. What is the longest the third fence can be?

   18
9. 9.

   Bo draws triangle ABC on a map. Corner A is 45° and corner B is 70°. Which side is the longest?

   • Side CA
   • Side BC
   • Side AB
10. 10.

    Esme draws triangle ABC on a map. Corner A is 30° and corner B is 50°. Which side is the longest?

    • Side AB
    • Side BC
    • Side CA