A photo width of 8cm, length of 14cm .if the perameter of photo is increased by 5o % , which dimension is for new perimeter.

Question

options are:
16cm by 28cm
12cm by 21cm
4cm by7cm
8cm by28 cm
i chose the first option cuz it increased 50.but i ma not sure if i am right.

Answer 1

Present perimeter: 16 + 28 = 44

44 * 1.5 = 66 = new perimeter

The perimeter you chose is 32 + 56 = 88

Check out the other options. Which produces a perimeter of 66 cm?

Answer 2

8cm by 28 cm ?
I am confused . Geometery is not my thing .

Answer 3

P = 2L + 2W

Present perimeter:

P = 2(8) + 2(14)

P = 16 + 28

P = 44

Answer 4

it make sense so , just apply the Perameter formula and put the valuse so answers is 44 then 44*1.5 = 66.

But How i have deal with increased 50% deminsion thing .
please can you simplfy this .

Answer 5

Use trial and error.

Using your choices, figure out the perimeter for each set of dimensions.

P = 2L + 2W

Which produces a perimeter of 66?

Answer 6

12cm by 21cm = 2*33= 66
??

Answer 7

Let's check it out.

P = 2(21) + 2 (12)
P = 42 + 24
P = 66

Right!

Answer 8

Thanks.

Answer 9

You're welcome.

Answer 10

there is options like 4cm by 7cm,8cm by 28cm 12cm by21cm16cm by28cm.how do I go to this options from 66.