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SAI International School

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

Answer Key:Worksheet- 2

Question Questions Marks
No.
1) In a right-angled triangle, the side opposite to the right angle is called the 1
__________.
Ans: hypotenuse
2) The line segment joining a vertex of a triangle to the mid point of its opposite 1
side is called a ___________of the triangle.
Ans: median
3) The base angles of an _________ triangle have equal measure. 1

Ans: isosceles

4) Which of the following statements is not correct? 1
(a) The sum of any two sides of a triangle is greater than the third side
(b) A triangle can have all its angles acute
(c) A right-angled triangle cannot be equilateral
(d) Difference of any two sides of a triangle is greater than the third side

Ans: (d) Difference of any two sides of a triangle is greater than the third side
5) If one angle of a triangle is equal to the sum of the other two angles, the 1
triangle is
(a) obtuse (b) acute (c) right (d) equilateral

Ans: (c) right
6) The lengths of two sides of a triangle are 11 cm and 18 cm. between what
two measures should the length of the third side fall?
Ans: 7 and 29
7) One of the angles of a triangle is 74º and the other two angles are equal.
Find the measure of each of the equal angles.
Ans:
0
180 - 74º = 106 0
0
0
measure of each of the equal angles = 106 ÷ 2 = 53
8) PQR is a triangle, right-angled at P. If PQ = 10cm and PR = 24 cm, find QR.
2
2
2
Ans: QR = PQ + PR
2
2
= 10 + 24
2
= 100 + 576 = 676 = 26
SO, QR = 26 cm
9) A 15 m long ladder reached a window 12 m high from the ground on placing
it against a wall at a distance “a”. Find the distance of the foot of the ladder
from the wall.