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.

   Milo sketches a tower roof end as an isosceles triangle. Its top angle is 100°, and its two base angles are equal. How big is each base angle, in degrees?

   40
3. 3.

   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
4. 4.

   Ari sketches a castle roof end as an isosceles triangle. Its two equal base angles are 25° each. How big is the top angle, in degrees?

   130
5. 5.

   Jun fences a triangular flower bed. Two fences are 5 ft and 13 ft long. The third fence is a whole number of feet. What is the longest the third fence can be?

   17
6. 6.

   Luz fences a triangular frog pond. Two fences are 3 ft and 10 ft long. The third fence is a whole number of feet. What is the shortest the third fence can be?

   8
7. 7.

   Milo fences a triangular carrot patch. Two fences are 6 ft and 14 ft long. The third fence is a whole number of feet. What is the shortest the third fence can be?

   9
8. 8.

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

   • Side AB
   • Side CA
   • Side BC
9. 9.

   Jun draws triangle ABC on a map. Corner A is 35° and corner B is 55°. Which side is the longest?

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

    Kira draws triangle ABC on a map. Corner A is 60° and corner B is 40°. Which side is the longest?

    • Side AB
    • Side BC
    • Side CA