Question

# Fill in the blanks with the correct word/symbol to make it a true statement: (i) A triangle has .......sides. (ii) A triangle has .......vertices. (iii) A triangle has .......angles. (iv) A triangle has .......parts. (v) A triangle whose no two sides are equal is known as ..... (vi) A triangle whose two sides are equal is known as .... (vii) A triangle whose all the sides are equal is known as...... (viii) A triangle whose one angle is a right angle is known as...... (ix) A triangle whose all the angles are of measure less than 90° is known as.... (x) A triangle whose one angle is more than 90° is known as ......

Solution

## (i) A triangle has three sides. (ii) A triangle has three vertices. (iii) A triangle has three angles. (iv) A triangle has six parts. (Angles and sides are part of a triangle. So, three angles and three sides make six parts). (v) A triangle whose no two sides are equal is known as Scalene triangle. (A triangle whose length of all sides are different is called Scalene triangle). (vi) A triangle whose two sides are equal is known as Isosceles triangle. (A triangle whose length of two sides are equal is called an Isosceles triangle). (vii) A triangle whose all the sides are equal is known as Equilateral triangle. (A triangle whose length of all sides are equal is called an Equilateral triangle). (viii) A triangle whose one angle is a right angle is known as Right angled triangle. (A triangle whose one angle is 90° is called a Right angled triangle). (ix) A triangle whose all angles measure less than 90° is known as an Acute triangle. (A triangle whose all angles are less than 90° is called an Acute triangle). (x) A triangle whose one angle is more than 90° is known as an Obtuse triangle. (A triangle whose one angle is more than 90° is called an Obtuse triangle).MathematicsRD Sharma (2013)Standard VI

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