CONSTRUCTIONS GRADE 9

Which of the following angle can be constructed with the help of a ruler and a pair of compasses?

• 35^°

• 40°

• 37.5°

• 47.5°

Which of the following sets of angles can be the angles of a triangle?

• 30°, 60°, 80°

• 40°, 60°, 70°

• 50°, 30°, 100°

• None of the above

If the construction of a triangle ABC in which AB = 6 cm, ∠A = 70° and ∠B = 40° is possible then find the measure of ∠C.

• 40°

• 70°

• 80°

• 90°

With the help of a ruler and compasses, which of the following is not possible to construct?

• 70°

• 60°

• 135°

• 15°

If a, b and c are the lengths of the three sides of a triangle, then which of the following is true?

• a + b < c

• a + b = c

• a – b < c

• a + b + c < 0

If we want to construct a triangle, given its perimeter, then we need to know:

• Sum of two sides of triangle

• Difference between two sides of triangle

• One base angles

• Two base angle

Which of the following set of lengths can be the sides of a triangle?

• 2 cm, 4 cm, 1.9 cm

• 1.6 cm, 3.7 cm, 5.3 cm

• 1.5 cm, 6.5 cm, 8.9 cm

• None of the above

The construction of a triangle ΔABC in which BC = 6 cm, ∠A = 50° is not possible, when difference of BC and AC is equal to

• 6.6 cm

• 6.4 cm

• 5.1 cm

• 6.2 cm

If a, b and c are the lengths of three sides of a triangle, then:

• a + b > c

• a – b > c

• a + b = c

• a – b - c = 0

In ΔABC if ∠B = ∠C = 30°, which is the longest side

• AB

• AC

• BC

• None of the abobe