Classifying Triangles Worksheet

**Page 2**

11.

Can a triangle be a right as well as an isosceles triangle at the same time?

a. | I don′t know. | ||

b. | No | ||

c. | Yes | ||

d. | Can′t say |

A triangle having two sides and 2 angles of equal measures is known as an isosceles triangle.

When one angle of a triangle is equal to 90

Correct answer : (3)

12.

Identify an acute triangle.

a. | Figure 1 | ||

b. | Figure 2 | ||

c. | Figure 3 | ||

d. | Figure 1 and Figure 3 |

Among the choices, figure 2 is an appropriate figure for the acute angled triangle.

Correct answer : (2)

13.

Classify the triangle by the measure of the angles.

a. | straight angle | ||

b. | acute triangle | ||

c. | right triangle | ||

d. | obtuse triangle |

In the figure, all of the angles are 60° and are less than 90°. Therefore, the triangle is called an acute triangle.

Correct answer : (2)

14.

Which triangle has all its three angles of different measures?

a. | isosceles triangle | ||

b. | equilateral triangle | ||

c. | scalene triangle | ||

d. | none of these |

In an isosceles triangle, two of the angles are of equal measures.

In a scalene triangle, all the three angles are of different measures.

Correct answer : (3)

15.

"Two of the angles measure 50^{o} each in a scalene triangle". State whether the statement is true or false.

a. | Can′t say | ||

b. | I don′t know. | ||

c. | True | ||

d. | False |

The measures of two angles in a scalene triangle cannot measure 50

So, the statement is not correct.

Correct answer : (4)

16.

Can a triangle have two angle measures equal to 90^{o} each?

a. | I don′t know | ||

b. | Yes | ||

c. | Can′ t say | ||

d. | No |

So, the measure of two angles in a triangle cannot be 90

Correct answer : (4)

17.

Find the value of $x$ in the figure.

a. | 8 cm | ||

b. | 6 cm | ||

c. | 5 cm | ||

d. | 7 cm |

So, it is an equilateral triangle.

In an equilateral triangle all sides are equal.

So, the value of

Correct answer : (3)

18.

Classify the triangle whose sides measure 7 in. , 8 in., and 5 in .

a. | equilateral triangle | ||

b. | right triangle | ||

c. | isosceles triangle | ||

d. | scalene triangle |

So, the triangle is a scalene triangle.

Correct answer : (4)

19.

Classify the triangle shown by the approximate measure of its angles.

a. | acute | ||

b. | right | ||

c. | obtuse | ||

d. | none of these |

So, the figure represents an acute angled triangle.

Correct answer : (1)

20.

If all the angles in a triangle are of the same measure, then each angle is equal to ____ .

a. | 80° | ||

b. | 110° | ||

c. | 60° | ||

d. | 90° |

Correct answer : (3)