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A triangle that is black and white...
The spider that is black with a white crescent on its back is the Brown House Spider. This spider is often confused with the red-back spider.
Black widow
thorn spider
My guess is that this spider you saw was either a Jumping Spider (quite possibly a Daring Jumping Spider) or a Parson Spider.
Black Widdow Spider PS:I am A student in the 6th grade
a type of jumping spider?
It may be One belonging to The Goldenrod Crab Spider family.
No they are not, but they are some ill lookin lil fckers
I just caught a spider that matches this description. After looking online, I think it may be a jumping spider from the family Salticidae. I believe that spider is Phidippus Audax a.k.a the Bold Jumping Spider.
The Zebra spider, Salticus scenicus, is known as such because of its black and white striped body. It is a common jumping spider.
Spiderman