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SAI International School

CLASS – VII
Mathematics
Chapter- 7: Triangle and its properties

Worksheet- 1

Question Questions Marks
No.
1) The lengths of two sides of a triangle are 11 cm and 18 cm. Between what 1
two measures should the length of the third side fall?

a. Median b. 6 and 20 c. 7 and 19 d. 7 and 29

Ans: d. 7 and 29
2) In a triangle, one angle is of 90°. Then 1
(i) The other two angles are of 45° each
(ii) In remaining two angles, one angle is 90° and other is 45°
(iii) Remaining two angles are complementary
In the given option(s) which is true?
(a) (i) only
(b) (ii) only
(c) (iii) only
(d) (i) and (ii)
Ans: (c) (iii) only

3) The sum of the lengths of any two sides of a triangle is ——— than the third 1
side.

a. greater than b. less than

c. equal to d. greater than equal to

Ans: a. greater than
4) The perpendicular line segment from a vertex of a triangle to its opposite 1
side is called an ____________of the triangle.
Ans: altitude
5) Which is the longest side in the triangle PQR, right-angled at P? 1
Ans: QR

0
6) One of the angles of a triangle is 30 . If the other two angles are of equal 2
measure, then find the measure of the other angles.

0
0
0
Ans: sum of two angles = 180 – 30 = 150
0
0
Measure of the other angle = 150 /2 = 75
7) Find the value of the unknown interior angle x in the following figure. 2