mathematics

Question 1

underline words . ……figures are figures all of whose points lie in the same plane.These figures can be pictured on a ……

Answer 1

plane geometric and flat surface

Question 2

triangle

Answer 2

3

Question 3

hexagon

Answer 3

6

Question 4

nonagon

Answer 4

9

Question 5

octagon

Answer 5

8

Question 6

decagon

Answer 6

10

Question 7

quidrilateral

Answer 7

4

Question 8

heptagon

Answer 8

7

Question 9

pentagon

Answer 9

5

Question 10

ratonal numbers.1a.add the following rational numbers 3/7 and -5/7

Answer 10

3/7 + -5/7 =3-5/7=-2/7

Question 11

ch2 formula. algebraic expression .a no increased by 10 =

Answer 11

x+10

Question 12

a no decreased by 27=

Answer 12

x-27

Question 13

twice a no added to 12=

Answer 13

x=x12

Question 14

five times a no decreased by 105

Answer 14

5x-105

Question 15

ch3 no of diagonal

Answer 15

(n-3)/2

Question 16

sum of int angle =

Answer 16

(2n-4)x90

Question 17

sum of ext angle

Answer 17

360 degree

Question 18

one of int

Answer 18

(2n-4)x90/n

Question 19

one of ext

Answer 19

360 degree/n

Question 20

fill in 1. if one l of a polygon is more than 180 ,than it is called polygon

Answer 20

concave

Question 21

2. if all l of a polygon is lss than 180 ,than it is called polygon

Answer 21

convex

Question 22

a …………………………….with all sides equal is called ……………….

Answer 22

regular polygon

Question 23

solve the following equation 1.7x-5=3by2x

Answer 23

7x-5=3.2x
7x-5=x
7x-6x=5
x=5