59. The sum of the three angles of a triangle is
- (A) 60°
- (B) 185°
- (C) 90°
- (D) 180°
58. The measure of any exterior angle of a triangle is equal to
- (A) the sum of the measures of its two interior opposite angles
- (B) the sum of the measures of its any two interior angles
- (C) the sum of the measures of its two exterior opposite angles
- (D) the sum of the measures of its two exterior angles
57. The line segment joining a vertex of a triangle to the mid-point of its opposite side is called its
- (A) Perpendicular
- (B) Median
- (C) Height
- (D) Altitude
56. How many altitudes can a triangle have?
- (A) 0
- (B) 1
- (C) 2
- (D) 3
55. How many medians can a triangle have?
- (A) 0
- (B) 1
- (C) 2
- (D) 3
54. The name of the triangle in which two altitudes of the triangle are two of its sides, is
- (A) Equilateral
- (B) Acute angled
- (C) Right angled
- (D) Obtuse angled
53. The name of the triangle in which the altitudes and medians are the same, is
- (A) Equilateral
- (B) Acute angled
- (C) Right angled
- (D) Obtuse angled
52. If all the sides of a triangle are equal, it is known as
- (A) Scalene
- (B) Isosceles
- (C) Right angled
- (D) Equilateral
51. If each angle of a triangle is of measure 60°, it is known as
- (A) Scalene
- (B) Equilateral
- (C) Right angled
- (D) Equilateral
50. If two angles of a triangle are 60° each, then the triangle is
- (A) Isosceles but not equilateral
- (B) Scalene
- (C) Equilateral
- (D) Right-angled
49. In a triangle if at least two of its sides are of the same length, it is known as
- (A) Scalene
- (B) Equilateral
- (C) Isosceles
- (D) Right-angled
48. In a right-angled triangle, the side opposite to the right angle is called the
- (A) hypotenuse
- (B) base
- (C) perpendicular
- (D) none of these
47. If the three sides of a triangle ABC are AB, BC and CA, then which of the following is always true?
- (A) AB + BC > CA
- (B) CA + AC > AB
- (C) AB + BC < CA
- (D) AB + BC = CA
46. If the three sides of a triangle ABC are AB, BC and CA, then which of the following is always true?
- (A) AB – BC > CA
- (B) CA – AC > AB
- (C) AB – BC < CA
- (D) AB – BC = CA
45. In ∆ABC, the side opposite to vertex A is
- (A) AB
- (B) BC
- (C) CA
- (D) None of these