Naming Triangles Based on Sides

Q.

How many equal sides does an isosceles triangle have?

1. Three

2. Four

3. Two

4. Seven

Q. 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 ......

Q.

How many equal sides does an isosceles triangle have?

1. Three

2. Four

3. Two

4. Seven

Q.

In a scalene triangle, all sides are ________ in length.

Q.

In a scalene triangle, ___________.

1. 2 sides are equal in length

2. all the sides are equal in length

3. all the sides are unequal in length

4. all the angles are equal

Q. Write the type of triangle for each of the descriptions given below.

(1) In ∆ABC, m∠A = 63°, m∠B = 52° and m∠C = 65°
(2) In ∆RST, seg RS and seg ST are equal.
(3) In ∆LMN, ∠LNM is a right angle.
(4) In ∆SDO, the measure of ∠OSD is 135°.
(5) All three sides of ∆RTO are of equal length.
(6) The sides of ∆DEF are 5.3 cm, 4.2 cm and 6.6 cm.

Q.

Match the following

1. 1- c; 2- b; 3- a

2. 1- a; 2- c; 3- b

3. 1- a; 2- b; 3- c

4. 1- c; 2- a; 3- b