Question

Need help!!
Find the perimeter of the following polygon.
https://d3myway.brainhoney.com/Resource/13056615,411,0,6/Assets/flvs/lamath_v8_gs_e11-xml/res0121/11_10_05.gif

Answer 1

Use pythagoras to find the missing side of the triangle first.

Answer 2

a^2+12^2=13^2?

Answer 3

169-144=25
a=5
where do I go from here?

Answer 4

Now you should be able to tell what the missing sides are.

Perimeter is the sum of the (external) sides.

Answer 5

So 13+13+10
So 36.
Thank you so much! You are awesome. Could you maybe help me with some more..

Answer 6

That's right. Sure.

Answer 7

How do you give metals?? Thanks for mine :)

Next question is :An outside circular ring has a circumference of 90 cm. What is the circumference of an inner ring which is 8 cm shorter in radius? Both circles have the same center.
Answer choices are: 11.3 cm
39.8 cm
54.8 cm
83.6 cm

Answer 8

click best response

circumference:\[\large C = 2 \pi r\]
it's 90, so\[\large 90 = 2 \pi r\]^take note of this for later

the radius of the inner one is 8cm shorter, so \\[\large C = 2\pi (r-8) \]\[\large C = 2 \pi r - 2 \pi*8\]\[\large C = 2\pi r - 16\pi\]
from earlier, 2pi*r = 90, so \[\large C = 90- 16\pi = ?\]

Answer 9

16pi=50.24?
so 90-50.24=39.76

Answer 10

Yep

Answer 11

Thank you! I know I might be bugging, but do you think you could help me with just ONE more?

Answer 12

Make a new question for it