Question

calculate the area and the peremeter of the remaining portion,after cutting four quadrants , each radius 7cm,from the four corners of a rectangle measuring 20 cm by 30 cm

Answer 1

@butterflydreamer
@ganeshie8
@perl
@Sadworld

Answer 2

@ganeshie8

Answer 3

draw it out

Answer 4

idk...

Answer 5

this is ur problem so you should know what the problem is about atleast

Answer 6

idk how to draw thats it

Answer 7

read the problem 2-3 times

Answer 8

i did cant understand

Answer 9

shall i calculate the area of the rectangle?

Answer 10

start by drawing this first
` rectangle measuring 20 cm by 30 cm`

Answer 11

always draw a rough diagram first for geometry problems even if it is not necessary

Answer 12

that helps in understanding the problem better

Answer 13

20 is l and 30 is w?

Answer 14

looks like it

Answer 15

i drew the rectangle on my paper now?

Answer 16

after cutting 7cm radius pieces from the corners, it should look like below :
http://community.coreldraw.com/cfs-file/__key/telligent-evolution-components-attachments/00-246-01-00-00-03-42-07/scalloped-rectangle.jpg

Answer 17

okay , now?

Answer 18

label the lengths and see if you can find the area and perimeter

Answer 19

let me know if you get stuck at a specific step

Answer 20

p is 100cm?
a is 600cm^2?

Answer 21

those are for rectangle with out cutting the corners

Answer 22

perimeter and area will change if you remove the corners

Answer 23

???????how do i calculate then????????????

Answer 24

for area, you may subtract the removed area from the total area

Answer 25

whats the area of circle of radius 7cm ?

Answer 26

quarter circle or a full circle which one?

Answer 27

full circle

Answer 28

four quarter circles make a full circle

Answer 29

after cutting the circle is it 446cm^2?

Answer 30

@rational ?

Answer 31

are you using 3.14 for pi ?

Answer 32

show ur work

Answer 33

before cutting
rectangle = 20 times 30 = 600
circle = pi time r^2 = 22/7 times 7 times 7 = 154
sub them = 600-154 = 446

Answer 34

sub them = 600-154 = 446
after cutting the circle ^^^

Answer 35

that looks perfect for area !
il let you work the perimeter

Answer 36

p = 2l + 2w = 40 + 60 = 100cm

Answer 37

for the rectangle

Answer 38

p = 2*pi*r = 2 times 22/7 time 7 = 44cm
for the circle

Answer 39

sub them ans you get 56

Answer 40

i'm right?

Answer 41

you need to be more careful with perimeter
notice that you need to add the perimeter of circle here because you're creating extra curves

Answer 42

?????????????????????????????????????????????????????????

Answer 43

add the perimeter of circle and subtract the removed edges

Answer 44

you're removing two edges of 7cm length from each corner
so in total you're removing 2*7*4 = 56cm from the perimeter

Answer 45

you're replacing that 54cm perimeter with a circle whose perimeter is 2*pi*7 = 44cm

Answer 46

so the perimeter of this rectangle with curved corners would be :

\[100 +44 - 56\]

Answer 47

simplify