Cake

I met my cousin at a family gathering. I was pretty close to him. We often hang out together since his house is pretty close to mine.
He told me about the job interview he did recently. 
“You know, I got this very mind-blowing psychological test in this interview. I asked most of my friends and they couldn’t answer it at all!” he said enthusiastically. 
I laughed, “You sure?”
“100% sure! I never found this kind of test everywhere! This test was so mind-blowing! Damn!”
“Okay, tell me the test.”
“Listen closely: there’s a cake. A round one. You have to divide it equally to 8 people, but you could cut it for 3 times only. How are you gonna cut it?”
I thought for a while.
“Wait, so there’s a cake…”
“Uh huh.”
“Round one and I have to cut it for 8 people equally…”
“But just 3 cuts, yes.”
Hmm…
I started to think again.
How’d you divide a cake equally for 8 people with 3 cuts only?!
My cousin hid his laugh seeing my confused face.
“C’mon. I just need 5 minutes to solve this! Hahaha!”
“Shut up, I’m trying to concentrate here!”
He laughed.
Uh… I, too, never found this kind of psychological test before.
“Is there no hint?”
“I only can say, you have to think outside the box, that’s all,” he said with a smug face.
Errgh…
I tried to imagine something round, divide it in two first but how can I make it equally divided…?
Eh… Wait….
“AH! I KNEW IT!”
My cousin laughed out loud, “I know you can!”

Dear readers, can you solve it?

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