polygons

Question 1

sum of interior angles

Answer 1

180x(n-2)

Question 2

size of ext angles

Answer 2

360/n

Question 3

size of int angles

Answer 3

sum of int angles/n

Question 4

how to know if its a triangle based on its dimensions(measurements)

Answer 4

the sum of any two sides is always greater than the third side

Question 5

altitude

Answer 5

perpendicular height of the triangle

Question 6

median

Answer 6

midpoint of side to opposite side

Question 7

perpendicular bisector

Answer 7

perpendicular to a side of triangle and goes through the midpoint

Question 8

trapezium(reason)

Answer 8

1 pr opp sides //

Question 9

parallelogram(reasons 5)

Answer 9

both prs opp sides //
both prs opp sides =
both prs opp angles =
diags bisect each other
1 pr opp sides = and //

Question 10

kite(reasons 5)

Answer 10

2 prs adj sides =
1 pr opp angles =
the long diag bisects short one
diags intersect at 90
long diag bisects int

Question 11

rhombus(reasons 5)

Answer 11

4 equal sides
diag bisect each other
diags meet at 90
diags bisect int angles

Question 12

square(reasons 5)

Answer 12

4 sides equal
all int angles =90
diags bisect int angles
diags =

Question 13

rectangle(reasons 2)

Answer 13

int angles = 90

diags =, bisect each other

Question 14

area of a trapezium

Answer 14

1/2(sum of // sides)xh

Question 15

area of parallelogram

Answer 15

bxh

Question 16

area of a kite

Answer 16

1/2xdxd2

Question 17

area of a rhombus

Answer 17

bxh

Question 18

area of a square

Answer 18

s2/ 1/2 dxd2

Question 19

area of rectangle

Answer 19

lxb

Question 20

c=?

Answer 20

pi.d/ 2.pi.r

Question 21

A=?

Answer 21

pi.r2