Question

The line segment which divides a side of a triangle into two equal parts is

called as……..

(x) The sum of complementary angles is always equal to….

Q.3. Write True and false against each statement : [Marks: 05]

(I) Adjacent angles have a common arm. [ ]

(ii) If two lines intersect at a point , then the vertically opposite angles are

equal. [ ]

(iii) The sum of the lengths of any two sides of a triangle is less than third

side. [ ]

(iv)The number 0 is neither a positive nor a negative rational number. [ ]

v) The additive inverse of 4/7 is -4/7. [ ]

Q.4 Do the sums as directed :. [Marks: 12]

Find the value of :

(I) -1/8 ÷ 3/4 (ii) (-4) ÷ 2/3

B. Rewrite the following rational numbers in the simplest form (I) 25/45.

(ii) -8/10

C. Convert each part of the ratio to percentage :

(I) 3:1. (ii) 1:4. ​

Answer 1

• Sum of complementary angles are 90°
• The number 0 is........... - True

Simplest Forms

1. 5/9
2. -4/5

Find the value of

1. -1/8÷3/4

-1/8 ×4/3 ( reciprocal because fraction does not divide so for multiplication we have to reciprocal )

Answer : -1/6

• (-4)÷ 2/3

(-4) × 3/2 ( above reason )

-6