### The Triangle and its Properties - Worksheets

CBSE Worksheet-1

CLASS – VII Mathematics (The triangle and its properties)

Choose correct option in questions 1 to 4.

- How many altitudes can a triangle have?

a) 3

b) 2

c) 1

d) None of these - Write the side opposite to the vertex B of ΔABC.

a) AB

b) AC

c) BC

d) None of these - A triangle in which, two sides act as the two altitudes is ___________________.

a) acute-angled triangle

b) obtuse-angled triangle

c) right-angled triangle

d) None of these - Answer in Yes or No.

a) Is it possible for a triangle to have two right angles? __________

b) Is it possible for a triangle to have two obtuse angles?__________

Fill in the blanks:

- A ____________ is a simple closed curve made of three-line segments.
- An ___________ has one end point at a vertex of the triangle and the other end point is contained in the opposite side to the vertex.
- The sum of interior opposite angles is ____when the exterior angle is right angle.
- The sum of the lengths of any two sides of a triangle is _________the third side.
- An exterior angle of a triangle is of measure 70º and one of its interior opposite angles is of measure 25º. Find the measure of the other interior opposite angle.
- Is a triangle possible with length of the sides as 10.2 cm, 5.8 cm and 4.5 cm?

CBSE Worksheet-1

CLASS – VII Mathematics (The triangle and its properties)

Answer key

- a
- b
- c
- a. No

b. No - triangle
- altitude
- right angle or 90º
- greater than
- 45º
- Yes because sum of any two sides taken is always greater than the third side.