Question

VERY EASY Just need someone to check this
Uploading photo at comment

Answer 1

Did I simplify it right?

Answer 2

what subject is this?

Answer 3

Mensuration

Answer 4

O_O!

Answer 5

Did I simplified it right ? the formula

Answer 6

1. not sure since I haven't done it
2. term sounds too close to menstruation .

Answer 7

LOL , how we feel while studying
anyways , the bottom is my final answer did i algebraically done it correctly?

Answer 8

?! can't really say.. never studied it.. is it physics, bio?

Answer 9

its related to geometry
but hey lets not focus on that topic,
all Im asking is the derivation of the formula :)

Answer 10

yeah looks legit.

Answer 11

I thank you with my spongy heart! :*